diff --git a/lib/libc/libc.mk b/lib/libc/libc.mk
index 85a58bf..b75d09c 100644
--- a/lib/libc/libc.mk
+++ b/lib/libc/libc.mk
@@ -29,6 +29,7 @@
 			strtok.c			\
 			strtoul.c			\
 			strtoll.c			\
+			strtoull.c			\
 			strtol.c)
 
 ifeq (${ARCH},aarch64)