diff --git a/net/netfilter/nf_conntrack_sip.c b/net/netfilter/nf_conntrack_sip.c
index b83dc9bf0a5d..78fd9122b70c 100644
--- a/net/netfilter/nf_conntrack_sip.c
+++ b/net/netfilter/nf_conntrack_sip.c
@@ -477,7 +477,7 @@ static int ct_sip_walk_headers(const struct nf_conn *ct, const char *dptr,
 				return ret;
 			if (ret == 0)
 				break;
-			dataoff += *matchoff;
+			dataoff = *matchoff;
 		}
 		*in_header = 0;
 	}
@@ -489,7 +489,7 @@ static int ct_sip_walk_headers(const struct nf_conn *ct, const char *dptr,
 			break;
 		if (ret == 0)
 			return ret;
-		dataoff += *matchoff;
+		dataoff = *matchoff;
 	}
 
 	if (in_header)