diff --git a/src/algorithm/map.rs b/src/algorithm/map.rs
index cb627e429..cc595f88a 100644
--- a/src/algorithm/map.rs
+++ b/src/algorithm/map.rs
@@ -66,9 +66,9 @@ pub const EMPTY_NAN: f64 =
 pub const TOMBSTONE_NAN: f64 =
     unsafe { std::mem::transmute(0x7ff8_0000_0000_0000u64 | 0x0000_0000_0000_0002) };
 
-fn hash_start<T: Hash>(value: &T, capacity: usize) -> usize {
+fn hash_start<T: ArrayValue>(arr: &Array<T>, capacity: usize) -> usize {
     let mut hasher = DefaultHasher::new();
-    value.hash(&mut hasher);
+    arr.hash(&mut hasher);
     hasher.finish() as usize % capacity
 }
 
@@ -319,7 +319,13 @@ impl<'a> Pair<'a> {
         self.keys.row_count()
     }
     fn hash_start(&self, key: &Value) -> usize {
-        hash_start(key, self.capacity())
+        key.generic_ref_shallow(
+            |arr| hash_start(arr, self.capacity()),
+            |arr| hash_start(arr, self.capacity()),
+            |arr| hash_start(arr, self.capacity()),
+            |arr| hash_start(arr, self.capacity()),
+            |arr| hash_start(arr, self.capacity()),
+        )
     }
     fn get(&self, key: &Value) -> Option<Value> {
         if self.keys.shape() == [0] {
diff --git a/tests/units.ua b/tests/units.ua
index 6c1aef5fc..01ba2e5c3 100644
--- a/tests/units.ua
+++ b/tests/units.ua
@@ -343,3 +343,5 @@ Maps ← ∩(remove 1) Maps
 ∩(⍤. has 3) Maps
 ∩(⍤. has "hi") Maps
 ∩(⍤. has [1 2 3]) Maps
+
+⍤⊃⋅∘≍ [2 3 4 1] ≡(get)[2 3 4 5]¤ ∧(insert) [5 2 3 4] [1 2 3 4] {}