diff --git a/src/core/iomgr/tcp_windows.c b/src/core/iomgr/tcp_windows.c
index 967177fdb1c..734628dd8ee 100644
--- a/src/core/iomgr/tcp_windows.c
+++ b/src/core/iomgr/tcp_windows.c
@@ -229,7 +229,7 @@ static void on_write(void *tcpp, int success) {
 
   if (!success) {
     tcp_unref(tcp);
-    cb(opaque, NULL, 0, GRPC_ENDPOINT_CB_SHUTDOWN);
+    cb(opaque, GRPC_ENDPOINT_CB_SHUTDOWN);
     return;
   }