diff --git a/.gitmodules b/.gitmodules
index e0bb88f8..51488dec 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -27,3 +27,6 @@
 [submodule "kcptun/go"]
 	path = kcptun/go
 	url = https://github.com/shadowsocks/go
+[submodule "src/main/jni/mbedtls"]
+	path = src/main/jni/mbedtls
+	url = https://github.com/ARMmbed/mbedtls
diff --git a/src/main/jni/mbedtls b/src/main/jni/mbedtls
new file mode 160000
index 00000000..1e4ec667
--- /dev/null
+++ b/src/main/jni/mbedtls
@@ -0,0 +1 @@
+Subproject commit 1e4ec667a4dd5f06ccc41d69cdef3e07f92fa242