diff --git a/libmaxsi/decl/size_t.h b/libmaxsi/decl/size_t.h
index 846c0ad0..bead15ec 100644
--- a/libmaxsi/decl/size_t.h
+++ b/libmaxsi/decl/size_t.h
@@ -1,4 +1,7 @@
 #ifndef _SIZE_T_DECL
+#ifndef _SIZE_T_DECLARED /* Compabillity with gcc */
 #define _SIZE_T_DECL
+#define _SIZE_T_DECLARED
 typedef __size_t size_t;
 #endif
+#endif