diff --git a/src/input.rs b/src/input.rs
index bdce2d19..4056713b 100644
--- a/src/input.rs
+++ b/src/input.rs
@@ -1,5 +1,6 @@
 use crate::runtime::QueryDescriptorSet;
 use crate::runtime::Revision;
+use crate::runtime::StampedValue;
 use crate::CycleDetected;
 use crate::MutQueryStorageOps;
 use crate::Query;
@@ -137,9 +138,3 @@ where
         map_write.insert(key, StampedValue { value, changed_at });
     }
 }
-
-#[derive(Clone)]
-struct StampedValue<V> {
-    value: V,
-    changed_at: Revision,
-}
diff --git a/src/memoized.rs b/src/memoized.rs
index 158b8d86..3a6c3b82 100644
--- a/src/memoized.rs
+++ b/src/memoized.rs
@@ -1,5 +1,6 @@
 use crate::runtime::QueryDescriptorSet;
 use crate::runtime::Revision;
+use crate::runtime::StampedValue;
 use crate::CycleDetected;
 use crate::Query;
 use crate::QueryContext;
@@ -75,11 +76,6 @@ where
     }
 }
 
-struct StampedValue<V> {
-    value: V,
-    changed_at: Revision,
-}
-
 impl<QC, Q> Default for MemoizedStorage<QC, Q>
 where
     Q: Query<QC>,
diff --git a/src/runtime.rs b/src/runtime.rs
index eee53ce7..9a58d7d8 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -235,3 +235,9 @@ impl<QC: QueryContext> QueryDescriptorSet<QC> {
         self.set.iter()
     }
 }
+
+#[derive(Clone, Debug)]
+crate struct StampedValue<V> {
+    crate value: V,
+    crate changed_at: Revision,
+}