diff --git a/Makefile b/Makefile
index fbc5d18..fa1cee3 100644
--- a/Makefile
+++ b/Makefile
@@ -31,7 +31,7 @@ BINS_MODE := 740
 
 # Compiler options
 CC := cc
-CC_OPTIONS = -O3
+CC_OPTIONS = -O2
 # C sources file format
 SRC_FMT := .c
 # Names of C programs to compile