diff --git a/tests/issue2040.fut b/tests/issue2040.fut
new file mode 100644
index 0000000000..6ae6633f75
--- /dev/null
+++ b/tests/issue2040.fut
@@ -0,0 +1,9 @@
+def fun [k] (n:i64) (op:[k]f32 -> *[k]f32) (_:[k]f32) =
+  let process (Q:*[n+1][k]f32) i =
+    let q = op Q[i]
+    in Q with [i+1] = q
+  let Q = replicate (n+1) (replicate k 0)
+  let Q = process Q 0
+  in Q
+
+entry test n k = fun n copy (replicate k 0)