diff --git a/libc/arch-arm64/arm64.mk b/libc/arch-arm64/arm64.mk
index a645949..a0eb954 100644
--- a/libc/arch-arm64/arm64.mk
+++ b/libc/arch-arm64/arm64.mk
@@ -1,27 +1,17 @@
 # arm64 specific configs
 
 libc_common_src_files_arm64 := \
-    bionic/memchr.c   \
-    bionic/memcmp.c   \
-    bionic/memcpy.c   \
-    bionic/memmove.c  \
-    bionic/memrchr.c  \
-    bionic/memset.c   \
+    bionic/index.cpp \
+    bionic/memchr.c \
+    bionic/__memcmp16.cpp \
+    bionic/memcmp.c \
+    bionic/memcpy.c \
+    bionic/memmove.c \
+    bionic/memrchr.c \
+    bionic/memset.c \
     bionic/strchr.cpp \
-    bionic/strnlen.c  \
-    string/bcopy.c    \
-    string/index.c    \
-    string/memcmp16.c \
-    string/strcat.c   \
-    string/strcmp.c   \
-    string/strcpy.c   \
-    string/strlcat.c  \
-    string/strlcpy.c  \
-    string/strlen.c   \
-    string/strncat.c  \
-    string/strncmp.c  \
-    string/strncpy.c  \
-    string/strrchr.c  \
+    bionic/strnlen.c \
+    bionic/strrchr.cpp \
     upstream-freebsd/lib/libc/string/wcscat.c \
     upstream-freebsd/lib/libc/string/wcschr.c \
     upstream-freebsd/lib/libc/string/wcscmp.c \
@@ -29,6 +19,16 @@
     upstream-freebsd/lib/libc/string/wcslen.c \
     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/strcat.c \
+    upstream-openbsd/lib/libc/string/strcmp.c \
+    upstream-openbsd/lib/libc/string/strcpy.c \
+    upstream-openbsd/lib/libc/string/strlcat.c \
+    upstream-openbsd/lib/libc/string/strlcpy.c \
+    upstream-openbsd/lib/libc/string/strlen.c \
+    upstream-openbsd/lib/libc/string/strncat.c \
+    upstream-openbsd/lib/libc/string/strncmp.c \
+    upstream-openbsd/lib/libc/string/strncpy.c \
 
 # Fortify implementations of libc functions.
 libc_common_src_files_arm64 += \