diff --git a/Makefile.defs b/Makefile.defs
index ee0ded0d948..1c05471f73a 100644
--- a/Makefile.defs
+++ b/Makefile.defs
@@ -699,6 +699,10 @@ ifeq ($(WITHAS), 1)
 	C_DEFS+= -DWITH_AS_SUPPORT
 endif
 
+ifeq ($(SCTP), 1)
+	C_DEFS+= -DUSE_SCTP
+endif
+
 ifeq ($(mode),)
 	mode = release
 endif