diff a/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp b/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
--- a/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
+++ b/src/hotspot/share/gc/shenandoah/c2/shenandoahBarrierSetC2.cpp
@@ -1,7 +1,7 @@
 /*
- * Copyright (c) 2018, 2023, Red Hat, Inc. All rights reserved.
+ * Copyright (c) 2018, 2026, Red Hat, Inc. All rights reserved.
  * Copyright Amazon.com Inc. or its affiliates. All Rights Reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
  * under the terms of the GNU General Public License version 2 only, as
@@ -953,10 +953,19 @@
 
     // Wire up the actual arraycopy stub now
     ctrl = phase->transform_later(region);
     mem = phase->transform_later(mem_phi);
 
+    if (should_copy_int_prefix(phase, ac)) {
+      mem = arraycopy_copy_int_prefix(phase, ctrl, mem, src, dest);
+
+      // We've copied the prefix, bump the pointers.
+      src = phase->basic_plus_adr(src_base, src, BytesPerInt);
+      dest = phase->basic_plus_adr(dest_base, dest, BytesPerInt);
+    }
+
+    // Bulk copy.
     const char* name = "arraycopy";
     call = phase->make_leaf_call(ctrl, mem,
                                  OptoRuntime::fast_arraycopy_Type(),
                                  phase->basictype2arraycopy(T_LONG, nullptr, nullptr, true, name, true),
                                  name, TypeRawPtr::BOTTOM,