diff --git a/googlemock/CMakeLists.txt b/googlemock/CMakeLists.txt
index 724fdd5f..a4e98afb 100644
--- a/googlemock/CMakeLists.txt
+++ b/googlemock/CMakeLists.txt
@@ -101,8 +101,8 @@ cxx_library(gmock_main
 # to the targets for when we are part of a parent build (ie being pulled
 # in via add_subdirectory() rather than being a standalone build).
 if (DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
-  target_include_directories(gmock      INTERFACE "${gmock_SOURCE_DIR}/include")
-  target_include_directories(gmock_main INTERFACE "${gmock_SOURCE_DIR}/include")
+  target_include_directories(gmock      SYSTEM INTERFACE "${gmock_SOURCE_DIR}/include")
+  target_include_directories(gmock_main SYSTEM INTERFACE "${gmock_SOURCE_DIR}/include")
 endif()
 
 ########################################################################
diff --git a/googletest/CMakeLists.txt b/googletest/CMakeLists.txt
index b9a920b7..f94d939d 100644
--- a/googletest/CMakeLists.txt
+++ b/googletest/CMakeLists.txt
@@ -103,8 +103,8 @@ target_link_libraries(gtest_main gtest)
 # to the targets for when we are part of a parent build (ie being pulled
 # in via add_subdirectory() rather than being a standalone build).
 if (DEFINED CMAKE_VERSION AND NOT "${CMAKE_VERSION}" VERSION_LESS "2.8.11")
-  target_include_directories(gtest      INTERFACE "${gtest_SOURCE_DIR}/include")
-  target_include_directories(gtest_main INTERFACE "${gtest_SOURCE_DIR}/include")
+  target_include_directories(gtest      SYSTEM INTERFACE "${gtest_SOURCE_DIR}/include")
+  target_include_directories(gtest_main SYSTEM INTERFACE "${gtest_SOURCE_DIR}/include")
 endif()
 
 ########################################################################