diff --git a/src/flow-send.c b/src/flow-send.c
index 83ca926..ad87024 100644
--- a/src/flow-send.c
+++ b/src/flow-send.c
@@ -76,7 +76,7 @@ int main(int argc, char **argv)
   u_int32 privacy_mask;
   unsigned int v1, v2, one;
   int i, n, ret, tx_delay, udp_sock;
-  int src_ip_spoof, hdr_len;
+  int src_ip_spoof, hdr_len = 0;
   void *rec;
 
   /* init fterr */
