diff --git a/src/proto_tcp.c b/src/proto_tcp.c
index cce0acb..a44912a 100644
--- a/src/proto_tcp.c
+++ b/src/proto_tcp.c
@@ -1641,7 +1641,7 @@
 			return -1;
 		}
 
-		hdr = calloc(sizeof(struct cap_hdr), 1);
+		hdr = calloc(1, sizeof(*hdr));
 		hdr->next = curpx->req_cap;
 		hdr->name = NULL; /* not a header capture */
 		hdr->namelen = 0;