diff --git a/a8/websocketsession.cc b/a8/websocketsession.cc
index dcf2dd4..0bd4eb8 100644
--- a/a8/websocketsession.cc
+++ b/a8/websocketsession.cc
@@ -212,8 +212,10 @@ namespace a8
             return;
         }
         if (opcode != BINARY_MODE) {
-            Close();
-            return;
+            if (opcode != WEBSOCKET_FRAME_PING) {
+                Close();
+                return;
+            }
         }
         if (!is_final_frame) {
             Close();