diff --git a/poincare/src/simplify/Makefile b/poincare/src/simplify/Makefile
index 619ae883f..15b521f6f 100644
--- a/poincare/src/simplify/Makefile
+++ b/poincare/src/simplify/Makefile
@@ -4,7 +4,7 @@ dir=poincare/src/simplify
 
 $(dir)/rules.cpp: $(RULEGEN) $(dir)/rules.pr
 	@echo "RULEGEN $@"
-	$(RULEGEN) < $(dir)/rules.pr > $@
+	@$(RULEGEN) < $(dir)/rules.pr > $@
 
 products += $(dir)/rules.cpp