diff --git a/tools/Makefile b/tools/Makefile
index 8ead015a5..5ce8ee0e3 100644
--- a/tools/Makefile
+++ b/tools/Makefile
@@ -1,4 +1,4 @@
-FLAGS ?= -O2 -g
+FLAGS ?= -Ofast -g
 SRCDIR ?= ..
 COMMON_FLAGS = $(FLAGS) -D_GNU_SOURCE -I$(SRCDIR)/src/
 MKDIR_P = mkdir -p