diff --git a/common/Makefile b/common/Makefile
index 2182b40..95057cc 100644
--- a/common/Makefile
+++ b/common/Makefile
@@ -27,7 +27,7 @@ CFLAGS += -std=gnu99
 CFLAGS += -DF_CPU=16000000L -D__AVR__ -D__AVR_ATmega328P__
 
 ## Tuning
-# CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
+CFLAGS += -funsigned-char -funsigned-bitfields -fpack-struct -fshort-enums
 
 # Debugging format.
 # Native formats for AVR-GCC's -g are stabs [default], or dwarf-2.