Missed one gtest reference.
diff --git a/test/cpp/common/BUILD b/test/cpp/common/BUILD
index 1830844..c8b3e46 100644
--- a/test/cpp/common/BUILD
+++ b/test/cpp/common/BUILD
@@ -36,9 +36,11 @@
     srcs = ["alarm_cpp_test.cc"],
     deps = [
         "//:grpc++",
-        "//external:gtest",
         "//test/core/util:gpr_test_util",
     ],
+    external_deps = [
+        "gtest",
+    ],
 )
 
 grpc_cc_test(