diff --git a/runtime/tests/vm/dart/regress_56948_test.dart b/runtime/tests/vm/dart/regress_56948_test.dart
new file mode 100644
index 000000000000..39b484bb1559
--- /dev/null
+++ b/runtime/tests/vm/dart/regress_56948_test.dart
@@ -0,0 +1,26 @@
+// Copyright (c) 2024, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+// The Dart Project Fuzz Tester (1.101).
+// Program generated as:
+//   dart dartfuzz.dart --seed 2618914219 --no-fp --no-ffi --flat
+// @dart=2.14
+
+import 'dart:typed_data';
+import 'dart:io';
+
+@pragma("vm:never-inline")
+foo() {
+  Int8List(28).fillRange(-19, 25, 9223372034707292160);
+}
+
+main() {
+  try {
+    foo();
+  } catch (e, st) {
+    print('foo throws');
+  }
+
+  sleep(Duration(seconds: 3)); // Let background compiler catch up.
+}
diff --git a/runtime/vm/compiler/backend/il_arm.cc b/runtime/vm/compiler/backend/il_arm.cc
index 7cb7243d4a1e..15e54c980192 100644
--- a/runtime/vm/compiler/backend/il_arm.cc
+++ b/runtime/vm/compiler/backend/il_arm.cc
@@ -2384,7 +2384,7 @@ LocationSummary* StoreIndexedInstr::MakeLocationSummary(Zone* zone,
       locs->set_in(2, Location::Pair(Location::RequiresRegister(),
                                      Location::RequiresRegister()));
     } else if (rep == kUnboxedInt8 || rep == kUnboxedUint8) {
-      locs->set_in(2, LocationRegisterOrConstant(value()));
+      locs->set_in(2, LocationRegisterOrSmiConstant(value()));
     } else {
       locs->set_in(2, Location::RequiresRegister());
     }