diff --git a/heed/src/txn.rs b/heed/src/txn.rs
index aa7e1e60..b6f9c202 100644
--- a/heed/src/txn.rs
+++ b/heed/src/txn.rs
@@ -57,7 +57,7 @@ fn abort_txn(txn: *mut ffi::MDB_txn) -> Result<()> {
     Ok(unsafe { ffi::mdb_txn_abort(txn) })
 }
 
-pub struct RwTxn<'e, 'p, T=()> {
+pub struct RwTxn<'e, 'p, T = ()> {
     pub(crate) txn: RoTxn<'e, T>,
     _parent: marker::PhantomData<&'p mut ()>,
 }