diff --git a/dist/tools/buildsystem_sanity_check/check.sh b/dist/tools/buildsystem_sanity_check/check.sh
index d14b87522c..7704287551 100755
--- a/dist/tools/buildsystem_sanity_check/check.sh
+++ b/dist/tools/buildsystem_sanity_check/check.sh
@@ -54,6 +54,7 @@ UNEXPORTED_VARIABLES+=('FLASHER' 'FFLAGS')
 UNEXPORTED_VARIABLES+=('RESET' 'RESETFLAGS')
 UNEXPORTED_VARIABLES+=('DEBUGGER' 'DEBUGGER_FLAGS')
 UNEXPORTED_VARIABLES+=('DEBUGSERVER' 'DEBUGSERVER_FLAGS')
+UNEXPORTED_VARIABLES+=('PREFLASHER' 'PREFFLAGS' 'FLASHDEPS')
 
 EXPORTED_VARIABLES_ONLY_IN_VARS=()
 check_not_exporting_variables() {