1 files changed, 1 insertions, 1 deletions

diff --git a/crates/ra_arena/src/lib.rs b/crates/ra_arena/src/lib.rs
index 3b7cb77b1..3ec8d3b60 100644
--- a/crates/ra_arena/src/lib.rs
+++ b/crates/ra_arena/src/lib.rs
@@ -79,7 +79,7 @@ impl<ID: ArenaId, T> Arena<ID, T> {
         self.data.push(value);
         ID::from_raw(id)
     }
-    pub fn iter(&self) -> impl Iterator<Item = (ID, &T)> {
+    pub fn iter(&self) -> impl Iterator<Item = (ID, &T)> + ExactSizeIterator {
         self.data.iter().enumerate().map(|(idx, value)| (ID::from_raw(RawId(idx as u32)), value))
     }
 }