diff --git a/test/cpp/end2end/async_end2end_test.cc b/test/cpp/end2end/async_end2end_test.cc
index 70df9e1..e347120 100644
--- a/test/cpp/end2end/async_end2end_test.cc
+++ b/test/cpp/end2end/async_end2end_test.cc
@@ -66,7 +66,7 @@
 
 namespace {
 
-void* tag(int i) { return (void*)(gpr_intptr)i; }
+void* tag(int i) { return (void*)(gpr_intptr) i; }
 
 void verify_ok(CompletionQueue* cq, int i, bool expect_ok) {
   bool ok;