diff --git a/CMakeLists.txt b/CMakeLists.txt
index 856bc98b..74b99341 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -267,7 +267,9 @@ add_subdirectory(src)
 
 if (BENCHMARK_ENABLE_TESTING)
   enable_testing()
-  if (BENCHMARK_ENABLE_GTEST_TESTS)
+  if (BENCHMARK_ENABLE_GTEST_TESTS AND
+      NOT (TARGET gtest AND TARGET gtest_main AND
+           TARGET gmock AND TARGET gmock_main))
     include(GoogleTest)
   endif()
   add_subdirectory(test)