diff --git a/src/Makefile b/src/Makefile
index f6ff0fc..d71be02 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -1,4 +1,4 @@
-CFLAGS=-g -O0 -Wall `pkg-config --cflags libosmocore 2> /dev/null` -I.
+CFLAGS=-g -O2 -Wall `pkg-config --cflags libosmocore 2> /dev/null` -I.
 LDLIBS=`pkg-config --libs libosmocore 2> /dev/null` -losmocore
 
 all: conv_enc_test crc_test tetra-rx float_to_bits tunctl