diff --git a/Makefile b/Makefile
index 89d5cbc60085d6e10019669278386eaeef5d68c6..22d390c21092c059db91a5a4828759a30c840804 100644
--- a/Makefile
+++ b/Makefile
@@ -25,7 +25,7 @@ mac:
             -framework OpenGL -framework GLUT -framework Cocoa
 
 macz:
-	gcc -DHAVE_ZLIB -Wall -g -o gl2psTest gl2psTest.c gl2ps.c\
+	gcc -DHAVE_ZLIB -Wall -g -O2 -o gl2psTest gl2psTest.c gl2ps.c\
             -framework OpenGL -framework GLUT -framework Cocoa -lz
 
 clean: