diff --git a/tests/checks/return.fish b/tests/checks/return.fish
index b63e336e4..9c2d7a4c5 100644
--- a/tests/checks/return.fish
+++ b/tests/checks/return.fish
@@ -20,3 +20,16 @@ $fish -ic 'echo interactive-foo; return 69; echo interactive-bar'
 # but not bar
 echo $status
 # CHECK: 69
+
+# Verify negative return values don't cause UB and never map to 0
+function empty_return
+    return $argv[1]
+end
+
+for i in (seq -550 -1)
+    empty_return $i
+    if test $status -eq 0
+        echo returning $i from a fish script maps to a $status of 0!
+    end
+end
+# CHECK: