diff --git a/cl_dll/aghl/agwallhack.h b/cl_dll/aghl/agwallhack.h
index 7147b715..85ef3ff3 100644
--- a/cl_dll/aghl/agwallhack.h
+++ b/cl_dll/aghl/agwallhack.h
@@ -6,7 +6,7 @@
 #pragma once
 #endif // _MSC_VER > 1000
 
-#ifdef AG_USE_CHEATPROTECTION
+#if defined(AG_USE_CHEATPROTECTION) && defined(_WIN32) 
 
 // ToolHelp Function Pointers so that it will work on NT4
 #include <tlhelp32.h>