diff --git a/panda/src/downloader/identityStream.cxx b/panda/src/downloader/identityStream.cxx
index f47d806c80..ce78718426 100644
--- a/panda/src/downloader/identityStream.cxx
+++ b/panda/src/downloader/identityStream.cxx
@@ -16,6 +16,7 @@
 
 // This module is not compiled if OpenSSL is not available.
 #ifdef HAVE_OPENSSL
+#include "httpChannel.h"
 
 ////////////////////////////////////////////////////////////////////
 //     Function: IIdentityStream::Destructor
diff --git a/panda/src/downloader/identityStreamBuf.cxx b/panda/src/downloader/identityStreamBuf.cxx
index 90df917fcc..f4b2076291 100644
--- a/panda/src/downloader/identityStreamBuf.cxx
+++ b/panda/src/downloader/identityStreamBuf.cxx
@@ -16,6 +16,7 @@
 
 // This module is not compiled if OpenSSL is not available.
 #ifdef HAVE_OPENSSL
+#include "httpChannel.h"
 
 #ifndef HAVE_STREAMSIZE
 // Some compilers (notably SGI) don't define this for us
diff --git a/panda/src/express/password_hash.cxx b/panda/src/express/password_hash.cxx
index 145476c63e..34670107e4 100644
--- a/panda/src/express/password_hash.cxx
+++ b/panda/src/express/password_hash.cxx
@@ -20,6 +20,7 @@
 
 #include "pnotify.h"
 #include "openssl/evp.h"
+#include "memoryHook.h"
 
 ////////////////////////////////////////////////////////////////////
 //     Function: password_hash
diff --git a/panda/src/express/virtualFileMount.cxx b/panda/src/express/virtualFileMount.cxx
index 1de64d446b..4be532b8a7 100644
--- a/panda/src/express/virtualFileMount.cxx
+++ b/panda/src/express/virtualFileMount.cxx
@@ -14,6 +14,7 @@
 
 #include "virtualFileMount.h"
 #include "virtualFileSimple.h"
+#include "virtualFileSystem.h"
 #include "zStream.h"
 
 TypeHandle VirtualFileMount::_type_handle;
diff --git a/panda/src/express/virtualFileSimple.cxx b/panda/src/express/virtualFileSimple.cxx
index 7a08bb5729..330b73e30f 100644
--- a/panda/src/express/virtualFileSimple.cxx
+++ b/panda/src/express/virtualFileSimple.cxx
@@ -15,6 +15,7 @@
 #include "virtualFileSimple.h"
 #include "virtualFileMount.h"
 #include "virtualFileList.h"
+#include "dcast.h"
 
 TypeHandle VirtualFileSimple::_type_handle;