diff --git a/.gitmodules b/.gitmodules
index 61a168b..c55793b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +1,6 @@
 [submodule "OpenSC"]
 	path = OpenSC
 	url = https://github.com/OpenSC/OpenSC
+[submodule "mbedtls"]
+	path = mbedtls
+	url = https://github.com/ARMmbed/mbedtls
diff --git a/mbedtls b/mbedtls
new file mode 160000
index 0000000..4fa604c
--- /dev/null
+++ b/mbedtls
@@ -0,0 +1 @@
+Subproject commit 4fa604cc3b55726c25dba459e9c1c4842a0cdfd7