diff --git a/Makefile.include b/Makefile.include
index aa34309140..35edb0c0e9 100644
--- a/Makefile.include
+++ b/Makefile.include
@@ -141,10 +141,6 @@ ifeq ($(WPEDANTIC),1)
   CFLAGS += -Wpedantic
 endif
 
-# remove this once codebase is adapted
-CFLAGS += -Wno-implicit-fallthrough
-CXXFLAGS += -Wno-implicit-fallthrough
-
 ifneq (10,$(if $(RIOT_VERSION),1,0)$(if $(__RIOTBUILD_FLAG),1,0))
 
 # Provide a shallow sanity check. You cannot call `make` in a module directory.