diff --git a/third_party/objective_c/google_toolbox_for_mac/BUILD b/third_party/objective_c/google_toolbox_for_mac/BUILD
index dc505f30fc3..9fc517c45eb 100644
--- a/third_party/objective_c/google_toolbox_for_mac/BUILD
+++ b/third_party/objective_c/google_toolbox_for_mac/BUILD
@@ -21,9 +21,6 @@ native.objc_library(
     srcs = [
         "UnitTesting/GTMGoogleTestRunner.mm",
     ],
-    copts = [
-        "-DGTM_USING_XCTEST",
-    ],
     deps = [
         "//external:gtest",
     ],