diff --git a/src/proto_http.c b/src/proto_http.c
index f86dcc3..4fc37ed 100644
--- a/src/proto_http.c
+++ b/src/proto_http.c
@@ -2083,6 +2083,9 @@
 					/* this Content-Type should be compressed */
 					break;
 			}
+		} else {
+			/* there is no Content-Type header */
+			goto fail;
 		}
 		/* this Content-Type should not be compressed */
 		if (comp_type == NULL)