diff --git a/src/h1.c b/src/h1.c
index 4c2e234..73de48b 100644
--- a/src/h1.c
+++ b/src/h1.c
@@ -750,6 +750,10 @@
 
 		if (likely(*ptr == ':')) {
 			col = ptr - start;
+			if (col <= sol) {
+				state = H1_MSG_HDR_NAME;
+				goto http_msg_invalid;
+			}
 			EAT_AND_JUMP_OR_RETURN(ptr, end, http_msg_hdr_l1_sp, http_msg_ood, state, H1_MSG_HDR_L1_SP);
 		}