diff --git a/build.zig b/build.zig
index 3b9e833..bd1f432 100644
--- a/build.zig
+++ b/build.zig
@@ -243,7 +243,7 @@ fn install_ly(allocator: std.mem.Allocator, patch_map: PatchMap, install_config:
         var pam_dir = std.fs.cwd().openDir(pam_path, .{}) catch unreachable;
         defer pam_dir.close();
 
-        try installFile("res/pam.d/ly", pam_dir, pam_path, "ly", .{ .override_mode = 0o644 });
+        try installFile(if (init_system == .freebsd) "res/pam.d/ly-freebsd" else "res/pam.d/ly-linux", pam_dir, pam_path, "ly", .{ .override_mode = 0o644 });
     }
 }
 
diff --git a/res/pam.d/ly-freebsd b/res/pam.d/ly-freebsd
new file mode 100644
index 0000000..1cefe07
--- /dev/null
+++ b/res/pam.d/ly-freebsd
@@ -0,0 +1,8 @@
+#%PAM-1.0
+
+# OpenPAM (used in FreeBSD) doesn't support prepending "-" for ignoring missing
+# modules.
+auth       include      login
+account    include      login
+password   include      login
+session    include      login
diff --git a/res/pam.d/ly b/res/pam.d/ly-linux
similarity index 100%
rename from res/pam.d/ly
rename to res/pam.d/ly-linux