diff --git a/crates/doc/src/links.rs b/crates/doc/src/links.rs
index 398b9171..c8a2c48e 100644
--- a/crates/doc/src/links.rs
+++ b/crates/doc/src/links.rs
@@ -276,7 +276,8 @@ impl Document {
                 walk(child, f);
             }
         }
-        for root in self.layers.iter_mut().chain(self.symbols.iter_mut().map(|s| &mut s.art)).chain(self.patterns.iter_mut().flat_map(|p| &mut p.art)) {
+        let roots = self.layers.iter_mut().chain(self.symbols.iter_mut().map(|s| &mut s.art)).chain(self.patterns.iter_mut().flat_map(|p| &mut p.art));
+        for root in roots {
             walk(root, &mut f);
         }
     }