diff --git a/Makefile b/Makefile
index b40bc5d..f0f8a12 100644
--- a/Makefile
+++ b/Makefile
@@ -5,7 +5,7 @@
 
 # Compiler options here.
 ifeq ($(USE_OPT),)
-  USE_OPT = -O2 -ggdb -fomit-frame-pointer -falign-functions=16
+  USE_OPT = -O2 -ggdb -fomit-frame-pointer -falign-functions=16 --specs=nano.specs
 endif
 
 # C specific options here (added to USE_OPT).