diff --git a/src/animations/Doom.zig b/src/animations/Doom.zig
index 1583165..daa203a 100644
--- a/src/animations/Doom.zig
+++ b/src/animations/Doom.zig
@@ -74,7 +74,7 @@ pub fn draw(self: Doom) void {
     }
 }
 
-fn initBuffer(buffer: []u8, width: u64) void {
+fn initBuffer(buffer: []u8, width: usize) void {
     const length = buffer.len - width;
     const slice_start = buffer[0..length];
     const slice_end = buffer[length..];
diff --git a/src/animations/Matrix.zig b/src/animations/Matrix.zig
index 9ed242e..ba7e6e1 100644
--- a/src/animations/Matrix.zig
+++ b/src/animations/Matrix.zig
@@ -77,9 +77,9 @@ pub fn draw(self: *Matrix) void {
         if (self.frame > 4) self.frame = 1;
         self.count = 0;
 
-        var x: u64 = 0;
+        var x: usize = 0;
         while (x < self.terminal_buffer.width) : (x += 2) {
-            var tail: u64 = 0;
+            var tail: usize = 0;
             var line = &self.lines[x];
             if (self.frame <= line.update) continue;
 
@@ -95,7 +95,7 @@ pub fn draw(self: *Matrix) void {
                 }
             }
 
-            var y: u64 = 0;
+            var y: usize = 0;
             var first_col = true;
             var seg_len: u64 = 0;
             height_it: while (y <= buf_height) : (y += 1) {
@@ -142,13 +142,13 @@ pub fn draw(self: *Matrix) void {
         }
     }
 
-    var x: u64 = 0;
+    var x: usize = 0;
     while (x < buf_width) : (x += 2) {
-        var y: u64 = 1;
+        var y: usize = 1;
         while (y <= self.terminal_buffer.height) : (y += 1) {
             const dot = self.dots[buf_width * y + x];
 
-            var fg: u16 = self.fg_ini;
+            var fg = self.fg_ini;
 
             if (dot.value == -1 or dot.value == ' ') {
                 _ = termbox.tb_set_cell(@intCast(x), @intCast(y - 1), ' ', fg, termbox.TB_DEFAULT);
@@ -161,16 +161,16 @@ pub fn draw(self: *Matrix) void {
     }
 }
 
-fn initBuffers(dots: []Dot, lines: []Line, width: u64, height: u64, random: Random) void {
-    var y: u64 = 0;
+fn initBuffers(dots: []Dot, lines: []Line, width: usize, height: usize, random: Random) void {
+    var y: usize = 0;
     while (y <= height) : (y += 1) {
-        var x: u64 = 0;
+        var x: usize = 0;
         while (x < width) : (x += 2) {
             dots[y * width + x].value = -1;
         }
     }
 
-    var x: u64 = 0;
+    var x: usize = 0;
     while (x < width) : (x += 2) {
         var line = lines[x];
         const h: isize = @intCast(height);
diff --git a/src/bigclock.zig b/src/bigclock.zig
index 9054a75..cfe61f5 100644
--- a/src/bigclock.zig
+++ b/src/bigclock.zig
@@ -111,7 +111,7 @@ pub fn clockCell(animate: bool, char: u8, fg: u16, bg: u16) [SIZE]termbox.tb_cel
     return cells;
 }
 
-pub fn alphaBlit(buffer: [*]termbox.tb_cell, x: u64, y: u64, tb_width: u64, tb_height: u64, cells: [SIZE]termbox.tb_cell) void {
+pub fn alphaBlit(buffer: [*]termbox.tb_cell, x: usize, y: usize, tb_width: usize, tb_height: usize, cells: [SIZE]termbox.tb_cell) void {
     if (x + WIDTH >= tb_width or y + HEIGHT >= tb_height) return;
 
     for (0..HEIGHT) |yy| {
diff --git a/src/config/Save.zig b/src/config/Save.zig
index 972c2b7..6186f14 100644
--- a/src/config/Save.zig
+++ b/src/config/Save.zig
@@ -1,2 +1,2 @@
 user: ?[]const u8 = null,
-session_index: ?u64 = null,
+session_index: ?usize = null,
diff --git a/src/config/migrator.zig b/src/config/migrator.zig
index 0ae6001..1295fa3 100644
--- a/src/config/migrator.zig
+++ b/src/config/migrator.zig
@@ -20,9 +20,9 @@ pub fn tryMigrateSaveFile(user_buf: *[32]u8, path: []const u8) Save {
     reader.streamUntilDelimiter(session_fbs.writer(), '\n', 20) catch {};
 
     const session_index_str = session_fbs.getWritten();
-    var session_index: ?u64 = null;
+    var session_index: ?usize = null;
     if (session_index_str.len > 0) {
-        session_index = std.fmt.parseUnsigned(u64, session_index_str, 10) catch return save;
+        session_index = std.fmt.parseUnsigned(usize, session_index_str, 10) catch return save;
     }
     save.session_index = session_index;
 
diff --git a/src/interop.zig b/src/interop.zig
index 23a90b9..23bb83e 100644
--- a/src/interop.zig
+++ b/src/interop.zig
@@ -26,10 +26,10 @@ pub const logincap = @cImport({
     @cInclude("login_cap.h");
 });
 
-pub const c_size = u64;
+pub const c_size = usize;
 pub const c_uid = u32;
 pub const c_gid = u32;
-pub const c_time = c_long;
+pub const c_time = c_longlong;
 pub const tm = extern struct {
     tm_sec: c_int,
     tm_min: c_int,
diff --git a/src/main.zig b/src/main.zig
index 42e617f..d10437d 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -299,8 +299,8 @@ pub fn main() !void {
 
             _ = termbox.tb_present(); // Required to update tb_width(), tb_height() and tb_cell_buffer()
 
-            const width: u64 = @intCast(termbox.tb_width());
-            const height: u64 = @intCast(termbox.tb_height());
+            const width: usize = @intCast(termbox.tb_width());
+            const height: usize = @intCast(termbox.tb_height());
 
             if (width != buffer.width) {
                 buffer.width = width;
@@ -398,7 +398,7 @@ pub fn main() !void {
                 try info_line.draw(buffer);
 
                 if (!config.hide_key_hints) {
-                    var length: u64 = 0;
+                    var length: usize = 0;
 
                     buffer.drawLabel(config.shutdown_key, length, 0);
                     length += config.shutdown_key.len + 1;
@@ -453,7 +453,7 @@ pub fn main() !void {
                     };
 
                     var lock_state_x = buffer.width - @min(buffer.width, lang.numlock.len);
-                    const lock_state_y: u64 = if (config.clock != null) 1 else 0;
+                    const lock_state_y: usize = if (config.clock != null) 1 else 0;
 
                     if (lock_state.numlock) buffer.drawLabel(lang.numlock, lock_state_x, lock_state_y);
 
diff --git a/src/tui/TerminalBuffer.zig b/src/tui/TerminalBuffer.zig
index ebc8ca7..71bf8aa 100644
--- a/src/tui/TerminalBuffer.zig
+++ b/src/tui/TerminalBuffer.zig
@@ -11,8 +11,8 @@ const termbox = interop.termbox;
 const TerminalBuffer = @This();
 
 random: Random,
-width: u64,
-height: u64,
+width: usize,
+height: usize,
 buffer: [*]termbox.tb_cell,
 fg: u16,
 bg: u16,
@@ -27,15 +27,15 @@ box_chars: struct {
     left: u32,
     right: u32,
 },
-labels_max_length: u64,
-box_x: u64,
-box_y: u64,
-box_width: u64,
-box_height: u64,
+labels_max_length: usize,
+box_x: usize,
+box_y: usize,
+box_width: usize,
+box_height: usize,
 margin_box_v: u8,
 margin_box_h: u8,
 
-pub fn init(config: Config, labels_max_length: u64, random: Random) TerminalBuffer {
+pub fn init(config: Config, labels_max_length: usize, random: Random) TerminalBuffer {
     return .{
         .random = random,
         .width = @intCast(termbox.tb_width()),
@@ -142,9 +142,9 @@ pub fn drawBoxCenter(self: *TerminalBuffer, show_borders: bool, blank_box: bool)
 }
 
 pub fn calculateComponentCoordinates(self: TerminalBuffer) struct {
-    x: u64,
-    y: u64,
-    visible_length: u64,
+    x: usize,
+    y: usize,
+    visible_length: usize,
 } {
     const x = self.box_x + self.margin_box_h + self.labels_max_length + 1;
     const y = self.box_y + self.margin_box_v;
@@ -157,11 +157,11 @@ pub fn calculateComponentCoordinates(self: TerminalBuffer) struct {
     };
 }
 
-pub fn drawLabel(self: TerminalBuffer, text: []const u8, x: u64, y: u64) void {
+pub fn drawLabel(self: TerminalBuffer, text: []const u8, x: usize, y: usize) void {
     drawColorLabel(text, x, y, self.fg, self.bg);
 }
 
-pub fn drawColorLabel(text: []const u8, x: u64, y: u64, fg: u16, bg: u16) void {
+pub fn drawColorLabel(text: []const u8, x: usize, y: usize, fg: u16, bg: u16) void {
     const yc: c_int = @intCast(y);
     const utf8view = std.unicode.Utf8View.init(text) catch return;
     var utf8 = utf8view.iterator();
@@ -172,7 +172,7 @@ pub fn drawColorLabel(text: []const u8, x: u64, y: u64, fg: u16, bg: u16) void {
     }
 }
 
-pub fn drawConfinedLabel(self: TerminalBuffer, text: []const u8, x: u64, y: u64, max_length: u64) void {
+pub fn drawConfinedLabel(self: TerminalBuffer, text: []const u8, x: usize, y: usize, max_length: usize) void {
     const yc: c_int = @intCast(y);
     const utf8view = std.unicode.Utf8View.init(text) catch return;
     var utf8 = utf8view.iterator();
@@ -184,7 +184,7 @@ pub fn drawConfinedLabel(self: TerminalBuffer, text: []const u8, x: u64, y: u64,
     }
 }
 
-pub fn drawCharMultiple(self: TerminalBuffer, char: u8, x: u64, y: u64, length: u64) void {
+pub fn drawCharMultiple(self: TerminalBuffer, char: u8, x: usize, y: usize, length: usize) void {
     const yc: c_int = @intCast(y);
     const cell = utils.initCell(char, self.fg, self.bg);
 
diff --git a/src/tui/components/Desktop.zig b/src/tui/components/Desktop.zig
index 98870d0..9151f97 100644
--- a/src/tui/components/Desktop.zig
+++ b/src/tui/components/Desktop.zig
@@ -35,13 +35,13 @@ pub const Entry = struct { @"Desktop Entry": DesktopEntry = DesktopEntry{} };
 allocator: Allocator,
 buffer: *TerminalBuffer,
 environments: EnvironmentList,
-current: u64,
-visible_length: u64,
-x: u64,
-y: u64,
+current: usize,
+visible_length: usize,
+x: usize,
+y: usize,
 lang: Lang,
 
-pub fn init(allocator: Allocator, buffer: *TerminalBuffer, max_length: u64, lang: Lang) !Desktop {
+pub fn init(allocator: Allocator, buffer: *TerminalBuffer, max_length: usize, lang: Lang) !Desktop {
     return .{
         .allocator = allocator,
         .buffer = buffer,
@@ -64,7 +64,7 @@ pub fn deinit(self: Desktop) void {
     self.environments.deinit();
 }
 
-pub fn position(self: *Desktop, x: u64, y: u64, visible_length: u64) void {
+pub fn position(self: *Desktop, x: usize, y: usize, visible_length: usize) void {
     self.x = x;
     self.y = y;
     self.visible_length = visible_length;
diff --git a/src/tui/components/Text.zig b/src/tui/components/Text.zig
index 412476a..e65e4a6 100644
--- a/src/tui/components/Text.zig
+++ b/src/tui/components/Text.zig
@@ -13,14 +13,14 @@ const Text = @This();
 allocator: Allocator,
 buffer: *TerminalBuffer,
 text: DynamicString,
-end: u64,
-cursor: u64,
-visible_start: u64,
-visible_length: u64,
-x: u64,
-y: u64,
+end: usize,
+cursor: usize,
+visible_start: usize,
+visible_length: usize,
+x: usize,
+y: usize,
 
-pub fn init(allocator: Allocator, buffer: *TerminalBuffer, max_length: u64) !Text {
+pub fn init(allocator: Allocator, buffer: *TerminalBuffer, max_length: usize) !Text {
     const text = try DynamicString.initCapacity(allocator, max_length);
 
     return .{
@@ -40,7 +40,7 @@ pub fn deinit(self: Text) void {
     self.text.deinit();
 }
 
-pub fn position(self: *Text, x: u64, y: u64, visible_length: u64) void {
+pub fn position(self: *Text, x: usize, y: usize, visible_length: usize) void {
     self.x = x;
     self.y = y;
     self.visible_length = visible_length;