diff --git a/CMakeLists.txt b/CMakeLists.txt
index fb8067d22..f4feee986 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -461,8 +461,6 @@ include_directories(${PROJECT_SOURCE_DIR}/include)
 include_directories(SYSTEM ${PROJECT_SOURCE_DIR}/third-party/gtest-1.7.0/fused-src)
 find_package(Threads REQUIRED)
 
-add_subdirectory(third-party/gtest-1.7.0/fused-src/gtest)
-
 # Main library source code
 
 set(SOURCES
@@ -843,6 +841,7 @@ endif()
 
 option(WITH_TESTS "build with tests" ON)
 if(WITH_TESTS)
+  add_subdirectory(third-party/gtest-1.7.0/fused-src/gtest)
   set(TESTS
         cache/cache_test.cc
         cache/lru_cache_test.cc