diff --git a/mingw-w64-headers/include/psdk_inc/intrin-impl.h b/mingw-w64-headers/include/psdk_inc/intrin-impl.h
index b99334b..97804fb 100644
--- a/mingw-w64-headers/include/psdk_inc/intrin-impl.h
+++ b/mingw-w64-headers/include/psdk_inc/intrin-impl.h
@@ -1448,9 +1448,11 @@
 
 #if __INTRINSIC_PROLOG(__readfsdword)
 unsigned __LONG32 __readfsdword(unsigned __LONG32 Offset);
+#if !__has_builtin(__readfsdword)
 __INTRINSICS_USEINLINE
 __buildreadseg(__readfsdword, unsigned __LONG32, "fs", "l")
 #define __INTRINSIC_DEFINED___readfsdword
+#endif
 #endif /* __INTRINSIC_PROLOG */
 
 #if __INTRINSIC_PROLOG(__writefsbyte)