diff --git a/Makefile b/Makefile
--- a/Makefile
+++ b/Makefile
@@ -39,6 +39,7 @@ JTENCODE_INCLUDES = -Ilib/jtencode
 # USER_CFLAGS: user C flags (enable warnings, enable debug info)
 USER_CFLAGS = -Wall -g -ffunction-sections -fdata-sections -Os -fno-common --function-sections -fdata-sections 
 #USER_CFLAGS += -flto
+USER_CFLAGS += --specs=nano.specs
 
 # USER_LDFLAGS:  user LD flags
 USER_LDFLAGS = -fno-exceptions -ffunction-sections -fdata-sections -Wl,--gc-sections