diff --git a/Makefile b/Makefile
index a718269a17ffbf02c91f64e09366bf4663d2cecb..6227088fb393e06a66a2e3e4e8dfdad932968a2b 100644
--- a/Makefile
+++ b/Makefile
@@ -33,7 +33,7 @@ regression_test:
 	echo "c=6" > $(OUT_E)
 	diff $(OUT_T) $(OUT_E)
 	./$(APP) 2 4 2 | tail -n 1 > $(OUT_T)
-	echo "c=6" > $(OUT_E)
+	echo "c=2" > $(OUT_E)
 	diff $(OUT_T) $(OUT_E)