diff --git a/lib/libc/libc_asm.mk b/lib/libc/libc_asm.mk
index e3f5c67..2f27265 100644
--- a/lib/libc/libc_asm.mk
+++ b/lib/libc/libc_asm.mk
@@ -28,6 +28,7 @@
 			strtok.c			\
 			strtoul.c			\
 			strtoll.c			\
+			strtoull.c			\
 			strtol.c)
 
 ifeq (${ARCH},aarch64)