diff --git a/include/belle-sip/utils.h b/include/belle-sip/utils.h
index 15b2c8c12801f57b7cf4b1c4aa077e60b4f8c833..4b6f51089f521306694c6fd6314cd0c975df1355 100644
--- a/include/belle-sip/utils.h
+++ b/include/belle-sip/utils.h
@@ -23,6 +23,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
+#include "defs.h"
 
 
 BELLE_SIP_BEGIN_DECLS