diff --git a/http_parser.c b/http_parser.c
index 122ede1..9c5640f 100644
--- a/http_parser.c
+++ b/http_parser.c
@@ -331,10 +331,20 @@ size_t http_parser_execute (http_parser *parser,
   uint64_t nread = parser->nread;
 
   if (len == 0) {
-    if (state == s_body_identity_eof) {
-      CALLBACK2(message_complete);
+    switch (state) {
+      case s_body_identity_eof:
+        CALLBACK2(message_complete);
+        return 0;
+
+      case s_dead:
+      case s_start_req_or_res:
+      case s_start_res:
+      case s_start_req:
+        return 0;
+
+      default:
+        return 1; // error
     }
-    return 0;
   }
 
   /* technically we could combine all of these (except for url_mark) into one
diff --git a/test.c b/test.c
index e5699aa..2d1d8bd 100644
--- a/test.c
+++ b/test.c
@@ -1735,14 +1735,22 @@ main (void)
 
   /// REQUESTS
 
-
   test_simple("hello world", 0);
   test_simple("GET / HTP/1.1\r\n\r\n", 0);
 
+
   test_simple("ASDF / HTTP/1.1\r\n\r\n", 0);
   test_simple("PROPPATCHA / HTTP/1.1\r\n\r\n", 0);
   test_simple("GETA / HTTP/1.1\r\n\r\n", 0);
 
+  // Well-formed but incomplete
+  test_simple("GET / HTTP/1.1\r\n"
+              "Content-Type: text/plain\r\n"
+              "Content-Length: 6\r\n"
+              "\r\n"
+              "fooba",
+              0);
+
   static const char *all_methods[] = {
     "DELETE",
     "GET",