diff --git a/Makefile b/Makefile
index a270978..f624e8a 100644
--- a/Makefile
+++ b/Makefile
@@ -11,6 +11,8 @@ SRC_C = \
 	main.c \
 	vectors.c \
 	serial.c \
+	bionic.c \
+	vsprintf.c \
 	utils.c
 
 SRC_S = \