diff --git a/Makefile b/Makefile
index 642f58a..3f265e5 100644
--- a/Makefile
+++ b/Makefile
@@ -39,9 +39,9 @@ LDFLAGS+=-lpthread
 CFLAGS+=-DUSE_PTHREAD
 endif
 ifndef USE_DEBUG
-CFLAGS+=-g -O0 -DNDEBUG -DNTRACE
+CFLAGS+=-O3 -DNDEBUG -DNTRACE
 else
-CFLAGS+=-03
+CFLAGS+=-g -O0
 endif
 
 # Tests if the last compilation was with pthread