diff --git a/programs/taskmgr/optnmenu.c b/programs/taskmgr/optnmenu.c
index 726531f2ee5..42f34e85437 100644
--- a/programs/taskmgr/optnmenu.c
+++ b/programs/taskmgr/optnmenu.c
@@ -48,7 +48,7 @@ void TaskManager_OnOptionsAlwaysOnTop(void)
      * Check or uncheck the always on top menu item
      * and update main window.
      */
-    if ((GetWindowLong(hMainWnd, GWL_EXSTYLE) & WS_EX_TOPMOST) != 0)
+    if ((GetWindowLongW(hMainWnd, GWL_EXSTYLE) & WS_EX_TOPMOST) != 0)
     {
         CheckMenuItem(hOptionsMenu, ID_OPTIONS_ALWAYSONTOP, MF_BYCOMMAND|MF_UNCHECKED);
         TaskManagerSettings.AlwaysOnTop = FALSE;
diff --git a/programs/taskmgr/run.c b/programs/taskmgr/run.c
index dc8cf7be3b9..ccd09ecc41e 100644
--- a/programs/taskmgr/run.c
+++ b/programs/taskmgr/run.c
@@ -52,7 +52,7 @@ void TaskManager_OnFileNew(void)
 {
     HMODULE            hShell32;
     RUNFILEDLG        RunFileDlg;
-    OSVERSIONINFO    versionInfo;
+    OSVERSIONINFOW    versionInfo;
     static const WCHAR wszShell32[] = {'S','H','E','L','L','3','2','.','D','L','L',0};
 
     hShell32 = LoadLibraryW(wszShell32);
@@ -62,8 +62,8 @@ void TaskManager_OnFileNew(void)
     if (RunFileDlg)
     {
         HICON hIcon = LoadIconW(GetModuleHandleW(NULL), MAKEINTRESOURCEW(IDI_TASKMANAGER));
-        versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFO);
-        GetVersionEx(&versionInfo);
+        versionInfo.dwOSVersionInfoSize = sizeof(OSVERSIONINFOW);
+        GetVersionExW(&versionInfo);
 
         if (versionInfo.dwPlatformId == VER_PLATFORM_WIN32_NT)
         {