diff --git a/Makefile b/Makefile
index 7142c6e..5b48816 100644
--- a/Makefile
+++ b/Makefile
@@ -5,6 +5,7 @@ export CPPFLAGS += -I"$(shell cd)"
 else
 export CPPFLAGS += -I"$(shell pwd)"
 endif
+export CXXFLAGS := -O3
 
 all: $(TARGET)