diff --git a/makefiles/app_dirs.inc.mk b/makefiles/app_dirs.inc.mk
index 9e17f5c2a5..ec5611a088 100644
--- a/makefiles/app_dirs.inc.mk
+++ b/makefiles/app_dirs.inc.mk
@@ -15,6 +15,7 @@ APPLICATION_DIRS :=                   \
     examples                          \
     tests                             \
     tests/bench                       \
+    tests/build_system                \
     tests/core                        \
     tests/drivers                     \
     tests/periph                      \