diff --git a/configure b/configure
index dcf2cc8..246999f 100755
--- a/configure
+++ b/configure
@@ -94,7 +94,7 @@ gen_CC () {
 ## flags used in the compilation step
 gen_CFLAGS () {
 	if [ -z "$debug" ]; then
-		cflags="$cflags -O3"
+		cflags="$cflags -Oz"
 	else
 		cflags="$cflags -O0 -g"
 	fi