diff --git a/Tests/CustomCommand/CMakeLists.txt b/Tests/CustomCommand/CMakeLists.txt
index 546a6cc52..0fd1523bd 100644
--- a/Tests/CustomCommand/CMakeLists.txt
+++ b/Tests/CustomCommand/CMakeLists.txt
@@ -193,6 +193,7 @@ FOREACH(arg ${CHECK_ARGS})
     "${EXPECTED_ARGUMENTS}  \"${ARG}\",
 ")
 ENDFOREACH(arg)
+SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} ${CMAKE_ANSI_CFLAGS}")
 CONFIGURE_FILE(${CMAKE_CURRENT_SOURCE_DIR}/check_command_line.c.in
                ${CMAKE_CURRENT_BINARY_DIR}/check_command_line.c
                @ONLY IMMEDIATE)