diff --git a/src/Makefile.cfg b/src/Makefile.cfg
index 28d487d27..bf98dab38 100644
--- a/src/Makefile.cfg
+++ b/src/Makefile.cfg
@@ -330,6 +330,7 @@ ifdef GCC61
 endif
 ifdef GCC71
  WFLAGS+=-Wimplicit-fallthrough=4
+ WFLAGS+=-Wno-format-truncation
 endif
 ifdef GCC81
  WFLAGS+=-Wno-error=format-overflow