diff --git a/firmware/rusefi_rules.mk b/firmware/rusefi_rules.mk
index d2b3a5b6a7..354774f617 100644
--- a/firmware/rusefi_rules.mk
+++ b/firmware/rusefi_rules.mk
@@ -1,7 +1,7 @@
 # Warnings-as-errors...
 RUSEFI_OPT = -Werror
 # some compilers seem to have this off by default?
-#RUSEFI_OPT += -Werror=stringop-truncation
+RUSEFI_OPT += -Werror=stringop-truncation
 
 ifneq ($(ALLOW_SHADOW),yes)
      RUSEFI_OPT += -Werror=shadow