diff --git a/.gitmodules b/.gitmodules
index fe32a049d6c..454c6bfbc89 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -46,4 +46,7 @@
 [submodule "src/rust-core-foundation"]
 	path = src/rust-core-foundation
 	url = git://github.com/pcwalton/rust-core-foundation.git
+[submodule "src/rust-io-surface"]
+	path = src/rust-io-surface
+	url = git://github.com/pcwalton/rust-io-surface.git
 
diff --git a/src/rust-io-surface b/src/rust-io-surface
new file mode 160000
index 00000000000..8e3eb37945e
--- /dev/null
+++ b/src/rust-io-surface
@@ -0,0 +1 @@
+Subproject commit 8e3eb37945e1c7ce72dd7bd483be262708bc6853