diff --git a/CMakeLists.txt b/CMakeLists.txt
index 80cd78237..5204cadc1 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -362,8 +362,10 @@ MARK_AS_ADVANCED(OSG_USE_FLOAT_BOUNDINGSPHERE)
 OPTION(OSG_USE_FLOAT_BOUNDINGBOX "Set to ON to build OpenSceneGraph with float BoundingBox instead of double." ON)
 MARK_AS_ADVANCED(OSG_USE_FLOAT_BOUNDINGBOX)
 
-OPTION(OSG_USE_UTF8_FILENAME "Set to ON to use a UTF8 locale for filenames instead of the default locale." OFF)
-MARK_AS_ADVANCED(OSG_USE_UTF8_FILENAME)
+IF (WIN32)
+    OPTION(OSG_USE_UTF8_FILENAME "Set to ON to use a UTF8 locale for filenames instead of the default locale." OFF)
+    MARK_AS_ADVANCED(OSG_USE_UTF8_FILENAME)
+ENDIF()
 
 OPTION(OSG_DISABLE_MSVC_WARNINGS "Set to OFF to not disable MSVC warnings generated by OSG headers." ON)
 MARK_AS_ADVANCED(OSG_DISABLE_MSVC_WARNINGS)