diff --git a/src/library_websocket.js b/src/library_websocket.js
index 4ea12baaa66e1..be2edcd3f8e67 100644
--- a/src/library_websocket.js
+++ b/src/library_websocket.js
@@ -155,7 +155,7 @@ var LibraryWebSocket = {
       dbg(`websocket event "open": socketId=${socketId},userData=${userData},callbackFunc=${callbackFunc})`);
 #endif
       HEAPU32[WS.socketEvent>>2] = socketId;
-      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+      {{{ makeDynCall('iipp', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
     }
     return {{{ cDefs.EMSCRIPTEN_RESULT_SUCCESS }}};
   },
@@ -181,7 +181,7 @@ var LibraryWebSocket = {
       dbg(`websocket event "error": socketId=${socketId},userData=${userData},callbackFunc=${callbackFunc})`);
 #endif
       HEAPU32[WS.socketEvent>>2] = socketId;
-      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+      {{{ makeDynCall('iipp', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
     }
     return {{{ cDefs.EMSCRIPTEN_RESULT_SUCCESS }}};
   },
@@ -210,7 +210,7 @@ var LibraryWebSocket = {
       HEAPU32[(WS.socketEvent+4)>>2] = e.wasClean;
       HEAPU32[(WS.socketEvent+8)>>2] = e.code;
       stringToUTF8(e.reason, WS.socketEvent+10, 512);
-      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+      {{{ makeDynCall('iipp', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
     }
     return {{{ cDefs.EMSCRIPTEN_RESULT_SUCCESS }}};
   },
@@ -262,7 +262,7 @@ var LibraryWebSocket = {
       }
       HEAPU32[(WS.socketEvent+4)>>2] = buf;
       HEAPU32[(WS.socketEvent+8)>>2] = len;
-      {{{ makeDynCall('iiii', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
+      {{{ makeDynCall('iipp', 'callbackFunc') }}}(0/*TODO*/, WS.socketEvent, userData);
       _free(buf);
     }
     return {{{ cDefs.EMSCRIPTEN_RESULT_SUCCESS }}};
diff --git a/test/test_sockets.py b/test/test_sockets.py
index 5ecc0d4a329a0..f13f269cffc27 100644
--- a/test/test_sockets.py
+++ b/test/test_sockets.py
@@ -349,3 +349,11 @@ def test_posix_proxy_sockets(self):
       with PythonTcpEchoServerProcess('7777'):
         # Build and run the TCP echo client program with Emscripten
         self.btest_exit('websocket/tcp_echo_client.c', args=['-lwebsocket', '-sPROXY_POSIX_SOCKETS', '-pthread', '-sPROXY_TO_PTHREAD'])
+
+
+class sockets64(sockets):
+  def setUp(self):
+    super().setUp()
+    self.set_setting('MEMORY64')
+    self.emcc_args.append('-Wno-experimental')
+    self.require_wasm64()