diff --git a/tests/CMakeLists.txt b/tests/CMakeLists.txt
index 73abfb9..3e9ea96 100644
--- a/tests/CMakeLists.txt
+++ b/tests/CMakeLists.txt
@@ -19,7 +19,7 @@ if (GCOV_ENABLE)
 	# build result is a pass or fail. 
 	add_custom_target(test_run_all
 		COMMAND cd ${PROJECT_BINARY_DIR}
-		COMMAND ${CMAKE_CTEST_COMMAND} --output-on-failure --timeout 30 && ${CMAKE_COMMAND} -E touch .ctest-finished || exit 0
+		COMMAND env CTEST_OUTPUT_ON_FAILURE=1 ctest --timeout 30 && ${CMAKE_COMMAND} -E touch .ctest-finished || exit 0
 		DEPENDS tests_clean tests
 	)