diff --git a/Makefile.include b/Makefile.include
index 0953f22c61..8027d9e9e7 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -174,7 +174,6 @@ buildtest:
 			RIOTBASE=$${RIOTBASE} \
 			RIOTBOARD=$${RIOTBOARD} \
 			RIOTCPU=$${RIOTCPU} \
-			CFLAGS="-w" \
 			$(MAKE) -B clean all 2>&1 >/dev/null) ; \
 		if [ "$${?}" = "0" ]; then \
 			$${ECHO} "$${GREEN}success$${RESET}"; \