diff --git a/libs/sofia-sip/libsofia-sip-ua/msg/msg_parser.c b/libs/sofia-sip/libsofia-sip-ua/msg/msg_parser.c
index 2ca0a35845..48c30d46ec 100644
--- a/libs/sofia-sip/libsofia-sip-ua/msg/msg_parser.c
+++ b/libs/sofia-sip/libsofia-sip-ua/msg/msg_parser.c
@@ -739,7 +739,7 @@ issize_t msg_buf_external(msg_t *msg,
 			  usize_t N,
 			  usize_t blocksize)
 {
-  msg_buffer_t *ext, *b, **bb;
+  msg_buffer_t *ext = NULL, *b, **bb;
   size_t i, I;
 
   assert(N <= 128 * 1024);