diff --git a/.gitmodules b/.gitmodules
index 67cabbe6..e69de29b 100644
--- a/.gitmodules
+++ b/.gitmodules
@@ -1,3 +0,0 @@
-[submodule "vendor/iostream"]
-	path = vendor/iostream
-	url = https://github.com/c-cube/ocaml-iostream
diff --git a/vendor/iostream b/vendor/iostream
deleted file mode 160000
index 668a7c22..00000000
--- a/vendor/iostream
+++ /dev/null
@@ -1 +0,0 @@
-Subproject commit 668a7c22c09d21293c9ce3fd8bc66b3080c525d2