diff --git a/src/Makefile.cfg b/src/Makefile.cfg
index c69fcd57d..4658eb4ff 100644
--- a/src/Makefile.cfg
+++ b/src/Makefile.cfg
@@ -234,8 +234,7 @@ ifdef GCC61
  WFLAGS+=-Wno-tautological-compare -Wno-error=tautological-compare
 endif
 ifdef GCC71
- WFLAGS+=-Wno-error=implicit-fallthrough
- WFLAGS+=-Wno-implicit-fallthrough
+ WFLAGS+=-Wimplicit-fallthrough=4
 endif
 ifdef GCC81
  WFLAGS+=-Wno-error=format-overflow