diff --git a/Tests/CMakeLists.txt b/Tests/CMakeLists.txt
index 7bb072156b..b43275aa61 100644
--- a/Tests/CMakeLists.txt
+++ b/Tests/CMakeLists.txt
@@ -1644,7 +1644,7 @@ ${CMake_BINARY_DIR}/bin/cmake -DDIR=dev -P ${CMake_SOURCE_DIR}/Utilities/Release
 
   if(CMake_TEST_XCODE_VERSION AND NOT CMake_TEST_XCODE_VERSION VERSION_LESS 5
      AND OSX_VERSION MATCHES "^([0-9]+\\.[0-9]+)")
-    set(XCTest_BUILD_OPTIONS -DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_MATCH_1})
+    set(XCTest_BUILD_OPTIONS -DCMAKE_OSX_DEPLOYMENT_TARGET=${CMAKE_MATCH_1} -DCMAKE_OSX_SYSROOT=macosx)
     ADD_TEST_MACRO(XCTest ${CMAKE_CTEST_COMMAND} -C $<CONFIGURATION> -V)
   endif()