diff --git a/cmake/libraries/testing.cmake b/cmake/libraries/testing.cmake
index 7a103694..57efbd55 100644
--- a/cmake/libraries/testing.cmake
+++ b/cmake/libraries/testing.cmake
@@ -1,7 +1,7 @@
-if(NOT PROJECT_BUILD AND PROJECT_ENABLE_TESTING)
-  add_definitions(-DPROJECT_ENABLE_TESTING)
-
-  if(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
+if (PROJECT_ENABLE_TESTING)
+  if(PROJECT_BUILD)
+    add_definitions(-DPROJECT_ENABLE_TESTING)
+  elseif(NOT PROJECT_IS_MINGW OR CMAKE_HOST_WIN32)
     ExternalProject_Add(gtest_project
       PREFIX external
       URL ${PROJECT_3RD_PARTY_DIR}/googletest-${GTEST_VERSION}.tar.gz