diff --git a/code/CMakeModules/nel.cmake b/code/CMakeModules/nel.cmake
index 74442086b..04d565c76 100644
--- a/code/CMakeModules/nel.cmake
+++ b/code/CMakeModules/nel.cmake
@@ -48,10 +48,9 @@ MACRO(NL_DEFAULT_PROPS name label)
     SET_TARGET_PROPERTIES(${name} PROPERTIES
       PROJECT_LABEL ${label})
   ENDIF(${type} STREQUAL SHARED_LIBRARY)
-  IF(WITH_STLPORT)
+  IF(WITH_STLPORT AND WIN32)
     SET_TARGET_PROPERTIES(${name} PROPERTIES COMPILE_FLAGS "/X")
-  ENDIF(WITH_STLPORT)
-  
+  ENDIF(WITH_STLPORT AND WIN32)
 ENDMACRO(NL_DEFAULT_PROPS)
 
 ###