diff --git a/headers/libs/freetype2/freetype/config/ftconfig.h b/headers/libs/freetype2/freetype/config/ftconfig.h
index 169da3cf3f..1aa009e6ec 100644
--- a/headers/libs/freetype2/freetype/config/ftconfig.h
+++ b/headers/libs/freetype2/freetype/config/ftconfig.h
@@ -357,8 +357,8 @@ FT_BEGIN_HEADER
       "shrl  $16, %%eax\n"
       "shll  $16, %%edx\n"
       "addl  %%edx, %%eax\n"
-      : "=a"(result), "+d"(b)
-      : "a"(a)
+      : "=a"(result), "=d"(b)
+      : "a"(a), "d"(b)
       : "%ecx" );
     return result;
   }