diff --git a/libc/arch-arm/arm.mk b/libc/arch-arm/arm.mk
index 2dbcb56..06b1675 100644
--- a/libc/arch-arm/arm.mk
+++ b/libc/arch-arm/arm.mk
@@ -26,6 +26,8 @@
     upstream-freebsd/lib/libc/string/wcsrchr.c \
     upstream-freebsd/lib/libc/string/wmemcmp.c \
     upstream-openbsd/lib/libc/string/bcopy.c \
+    upstream-openbsd/lib/libc/string/stpcpy.c \
+    upstream-openbsd/lib/libc/string/stpncpy.c \
     upstream-openbsd/lib/libc/string/strlcat.c \
     upstream-openbsd/lib/libc/string/strlcpy.c \
     upstream-openbsd/lib/libc/string/strncat.c \