diff --git a/Makefile b/Makefile
index 799d83c..fab8610 100644
--- a/Makefile
+++ b/Makefile
@@ -4,7 +4,7 @@ compile:
 	bison Monicelli.ypp
 	flex Monicelli.lpp
 	g++ \
-    -Wall -Wno-deprecated-register -std=c++11 -DYYDEBUG=0 \
+    -Wall -Wno-deprecated-register -std=c++11 -DYYDEBUG=0 -O2 \
     Parser.cpp lex.yy.cc Nodes.cpp main.cpp -o mcc
 
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