diff --git a/runtime/src/lib.rs b/runtime/src/lib.rs
index d72a558..dbf8570 100644
--- a/runtime/src/lib.rs
+++ b/runtime/src/lib.rs
@@ -52,10 +52,6 @@ pub type Signature = MultiSignature;
 /// to the public key of our transaction signing scheme.
 pub type AccountId = <<Signature as Verify>::Signer as IdentifyAccount>::AccountId;
 
-/// The type for looking up accounts. We don't expect more than 4 billion of them, but you
-/// never know...
-pub type AccountIndex = u32;
-
 /// Balance of an account.
 pub type Balance = u128;