diff --git a/src/internal.h b/src/internal.h
index edc3587959..00edd4fdeb 100644
--- a/src/internal.h
+++ b/src/internal.h
@@ -128,14 +128,10 @@
  *
  */
 # ifndef ATTRIBUTE_MOCKABLE
-#  if defined(WIN32)
-#   define ATTRIBUTE_MOCKABLE
+#  if __GNUC_PREREQ(4, 5)
+#   define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __noclone__, __weak__))
 #  else
-#   if __GNUC_PREREQ(4, 5)
-#    define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __noclone__, __weak__))
-#   else
-#    define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __weak__))
-#   endif
+#   define ATTRIBUTE_MOCKABLE __attribute__((__noinline__, __weak__))
 #  endif
 # endif