diff --git a/proxy/http2/Http2ConnectionState.cc b/proxy/http2/Http2ConnectionState.cc
index bf4a7aa447d..32486438b03 100644
--- a/proxy/http2/Http2ConnectionState.cc
+++ b/proxy/http2/Http2ConnectionState.cc
@@ -270,7 +270,7 @@ rcv_headers_frame(Http2ConnectionState &cstate, const Http2Frame &frame)
     }
     // Protocol error if the stream depends on itself
     if (stream_id == params.priority.stream_dependency) {
-      return Http2Error(Http2ErrorClass::HTTP2_ERROR_CLASS_CONNECTION, Http2ErrorCode::HTTP2_ERROR_PROTOCOL_ERROR,
+      return Http2Error(Http2ErrorClass::HTTP2_ERROR_CLASS_STREAM, Http2ErrorCode::HTTP2_ERROR_PROTOCOL_ERROR,
                         "recv headers self dependency");
     }
 
@@ -387,6 +387,12 @@ rcv_priority_frame(Http2ConnectionState &cstate, const Http2Frame &frame)
                       "priority parse error");
   }
 
+  //  A stream cannot depend on itself.  An endpoint MUST treat this as a stream error of type PROTOCOL_ERROR.
+  if (stream_id == priority.stream_dependency) {
+    return Http2Error(Http2ErrorClass::HTTP2_ERROR_CLASS_STREAM, Http2ErrorCode::HTTP2_ERROR_PROTOCOL_ERROR,
+                      "PRIORITY frame depends on itself");
+  }
+
   DebugHttp2Stream(cstate.ua_session, stream_id, "PRIORITY - dep: %d, weight: %d, excl: %d, tree size: %d",
                    priority.stream_dependency, priority.weight, priority.exclusive_flag, cstate.dependency_tree->size());