diff --git a/dist/tools/buildsystem_sanity_check/check.sh b/dist/tools/buildsystem_sanity_check/check.sh
index 21e3e055e7..25aa14a8ad 100755
--- a/dist/tools/buildsystem_sanity_check/check.sh
+++ b/dist/tools/buildsystem_sanity_check/check.sh
@@ -85,6 +85,7 @@ UNEXPORTED_VARIABLES+=('OPENOCD_ADAPTER_INIT')
 UNEXPORTED_VARIABLES+=('OPENOCD_CONFIG')
 UNEXPORTED_VARIABLES+=('OPENOCD_RESET_USE_CONNECT_ASSERT_SRST')
 UNEXPORTED_VARIABLES+=('OPENOCD_PRE_FLASH_CMDS' 'OPENOCD_PRE_VERIFY_CMDS')
+UNEXPORTED_VARIABLES+=('PRE_FLASH_CHECK_SCRIPT')
 UNEXPORTED_VARIABLES+=('FLASH_TARGET_TYPE')
 UNEXPORTED_VARIABLES+=('PYOCD_ADAPTER_INIT')
 UNEXPORTED_VARIABLES+=('JLINK_DEVICE' 'JLINK_IF')