diff --git a/Makefile b/Makefile
index a7e4b47..ce28bf5 100644
--- a/Makefile
+++ b/Makefile
@@ -51,7 +51,7 @@ TEST_TARGET=rmc_test
 WIRESHARK_TARGET=rmc_wireshark_plugin.so
 DESTDIR ?= /usr/local
 
-CFLAGS ?= -O3 -fpic -Wall -D_GNU_SOURCE
+CFLAGS ?= -O2 -fpic -Wall -D_GNU_SOURCE
 
 .PHONY: all clean etags print_obj install uninstall