diff --git a/libc/Android.mk b/libc/Android.mk
index 6a77deb..a781967 100644
--- a/libc/Android.mk
+++ b/libc/Android.mk
@@ -257,6 +257,7 @@
 	tzcode/strftime.c \
 	tzcode/strptime.c \
 	bionic/__set_errno.c \
+	bionic/__umask_chk.c \
 	bionic/bionic_clone.c \
 	bionic/cpuacct.c \
 	bionic/arc4random.c \