diff --git a/Sources/Plasma/CoreLib/CMakeLists.txt b/Sources/Plasma/CoreLib/CMakeLists.txt
index e300eede33..bf6b0e1464 100644
--- a/Sources/Plasma/CoreLib/CMakeLists.txt
+++ b/Sources/Plasma/CoreLib/CMakeLists.txt
@@ -21,7 +21,7 @@ set(CoreLib_SOURCES
     plLoadMask.cpp
     plProduct.cpp
     plViewTransform.cpp
-    hsWindows.cpp
+    $<$<PLATFORM_ID:Windows>:hsWindows.cpp>
 )
 
 if(CMAKE_USE_WIN32_THREADS_INIT)
diff --git a/Sources/Plasma/CoreLib/hsWindows.cpp b/Sources/Plasma/CoreLib/hsWindows.cpp
index 5b7bfc0c28..f6274bf91b 100644
--- a/Sources/Plasma/CoreLib/hsWindows.cpp
+++ b/Sources/Plasma/CoreLib/hsWindows.cpp
@@ -40,8 +40,6 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 
 *==LICENSE==*/
 
-#ifdef HS_BUILD_FOR_WIN32
-
 #include "HeadSpin.h"
 #include "hsWindows.h"
 #include <combaseapi.h>
@@ -93,5 +91,3 @@ const RTL_OSVERSIONINFOEXW& hsGetWindowsVersion()
     }
     return s_WinVer;
 }
-
-#endif