diff --git a/CMakeLists.txt b/CMakeLists.txt
index e1a1dc8..807f6e2 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -173,7 +173,7 @@ provided mocks to test code involving the Cloud C++ clients may wish to turn
 this flag off.]==]
     ON
     "NOT BUILD_TESTING"
-    ON)
+    $<IF:$<BOOL:${BUILD_TESTING}>:OFF:ON>)
 mark_as_advanced(GOOGLE_CLOUD_CPP_WITH_MOCKS)
 
 # The examples use exception handling to simplify the code. Therefore they
@@ -246,7 +246,7 @@ include(CTest)
 # used in the depends condition of the next option.
 include(EnableCxxExceptions)
 
-if (BUILD_TESTING)
+if (BUILD_TESTING OR GOOGLE_CLOUD_CPP_WITH_MOCKS)
     # Discover and add targets for the GTest::gtest and GTest::gmock libraries.
     include(FindGMockWithTargets)
 endif ()