diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 00000000..ad76f757
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,4 @@
+[submodule "src/lzma-sdk"]
+	path = src/lzma-sdk
+	url = https://github.com/upx/upx-lzma-sdk.git
+	branch = master
diff --git a/src/lzma-sdk b/src/lzma-sdk
new file mode 160000
index 00000000..addcc785
--- /dev/null
+++ b/src/lzma-sdk
@@ -0,0 +1 @@
+Subproject commit addcc7852afd2dfd081841ee344beddbd03f12ae