diff --git a/src/Mod/Mesh/App/WildMagic4/Wm4System.cpp b/src/Mod/Mesh/App/WildMagic4/Wm4System.cpp
index dc625384b6..5826665825 100644
--- a/src/Mod/Mesh/App/WildMagic4/Wm4System.cpp
+++ b/src/Mod/Mesh/App/WildMagic4/Wm4System.cpp
@@ -22,7 +22,7 @@ using namespace Wm4;
 #include <sys/stat.h>
 
 // support for GetTime
-#if !defined(WIN32)
+#if !defined(_WIN32)
 #include <sys/time.h>
 static timeval gs_kInitial;
 static bool gs_bInitializedTime = false;
@@ -103,7 +103,7 @@ void System::EndianCopy (int iSize, int iQuantity, const void* pvSrc,
 //----------------------------------------------------------------------------
 double System::GetTime ()
 {
-#if !defined(WIN32)
+#if !defined(_WIN32)
     if (!gs_bInitializedTime)
     {
         gs_bInitializedTime = true;