diff --git a/include/wx/fs_inet.h b/include/wx/fs_inet.h
index ce193551b1..61f4e5d056 100644
--- a/include/wx/fs_inet.h
+++ b/include/wx/fs_inet.h
@@ -18,6 +18,8 @@ limitation)
 
 
 */
+#ifndef _WX_FS_INET_H_
+#define _WX_FS_INET_H_
 
 #ifdef __GNUG__
 #pragma interface "fs_inet.h"
@@ -51,3 +53,5 @@ class WXDLLEXPORT wxInternetFSHandler : public wxFileSystemHandler
 #endif
   // wxUSE_FILESYSTEM && wxUSE_FS_INET && wxUSE_STREAMS && wxUSE_SOCKETS
 
+#endif // _WX_FS_INET_H_
+
diff --git a/include/wx/fs_mem.h b/include/wx/fs_mem.h
index 96946d350f..03fa523eee 100644
--- a/include/wx/fs_mem.h
+++ b/include/wx/fs_mem.h
@@ -6,6 +6,8 @@
 // Licence:     wxWindows Licence
 /////////////////////////////////////////////////////////////////////////////
 
+#ifndef _WX_FS_MEM_H_
+#define _WX_FS_MEM_H_
 
 #ifdef __GNUG__
 #pragma interface "fs_mem.h"
@@ -63,3 +65,5 @@ class WXDLLEXPORT wxMemoryFSHandler : public wxFileSystemHandler
   // wxUSE_FILESYSTEM
 
 
+#endif // _WX_FS_MEM_H_
+
diff --git a/include/wx/fs_zip.h b/include/wx/fs_zip.h
index fa1ddab430..960a1fd1a5 100644
--- a/include/wx/fs_zip.h
+++ b/include/wx/fs_zip.h
@@ -7,6 +7,8 @@
 // Licence:     wxWindows Licence
 /////////////////////////////////////////////////////////////////////////////
 
+#ifndef _WX_FS_ZIP_H_
+#define _WX_FS_ZIP_H_
 
 #ifdef __GNUG__
 #pragma interface "fs_zip.h"
@@ -52,3 +54,5 @@ class WXDLLEXPORT wxZipFSHandler : public wxFileSystemHandler
 #endif
   // wxUSE_FILESYSTEM && wxUSE_FS_ZIP && wxUSE_STREAMS
 
+#endif // _WX_FS_ZIP_H_
+