diff --git a/2.x/trunk/ProcessHacker/include/phapp.h b/2.x/trunk/ProcessHacker/include/phapp.h
index 6f7020d78..e2997c72f 100644
--- a/2.x/trunk/ProcessHacker/include/phapp.h
+++ b/2.x/trunk/ProcessHacker/include/phapp.h
@@ -44,6 +44,12 @@ extern COLORREF PhSysWindowColor;
 
 // main
 
+#ifdef _WIN64
+#define PH_EXECUTING_IN_WOW64 (FALSE)
+#else
+#define PH_EXECUTING_IN_WOW64 (USER_SHARED_DATA->NativeProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
+#endif
+
 typedef struct _PH_STARTUP_PARAMETERS
 {
     union
diff --git a/2.x/trunk/ProcessHacker/main.c b/2.x/trunk/ProcessHacker/main.c
index b354b9f17..a5de4a47d 100644
--- a/2.x/trunk/ProcessHacker/main.c
+++ b/2.x/trunk/ProcessHacker/main.c
@@ -245,8 +245,7 @@ INT WINAPI wWinMain(
         RtlExitUserProcess(STATUS_SUCCESS);
     }
 
-#ifndef _WIN64
-    if (USER_SHARED_DATA->NativeProcessorArchitecture == PROCESSOR_ARCHITECTURE_AMD64)
+    if (PH_EXECUTING_IN_WOW64)
     {
         PhShowWarning(
             NULL,
@@ -255,7 +254,6 @@ INT WINAPI wWinMain(
             L"Please run the 64-bit version of Process Hacker instead."
             );
     }
-#endif
 
     PhPluginsEnabled = PhGetIntegerSetting(L"EnablePlugins") && !PhStartupParameters.NoPlugins;