diff --git a/src/builtin.cpp b/src/builtin.cpp
index 1f6542dcf0..624a1b2c10 100644
--- a/src/builtin.cpp
+++ b/src/builtin.cpp
@@ -457,6 +457,11 @@ Java_java_lang_System_arraycopy
                    sbody + (srcOffset * elementSize),
                    length * elementSize);
           }
+
+          if (classObjectMask(t, objectClass(t, d))) {
+            mark(t, reinterpret_cast<object*>(dbody) + dstOffset, length);
+          }
+
           return;
         }
       }
diff --git a/src/machine.h b/src/machine.h
index e8a8ecb481..b9b093d15e 100644
--- a/src/machine.h
+++ b/src/machine.h
@@ -1417,6 +1417,17 @@ allocate(Thread* t, unsigned sizeInBytes)
   }
 }
 
+inline void
+mark(Thread* t, object* targets, unsigned count)
+{
+  if (t->m->heap->needsMark(reinterpret_cast<void**>(targets))) {
+    ACQUIRE_RAW(t, t->m->heapLock);
+    for (unsigned i = 0; i < count; ++i) {
+      t->m->heap->mark(reinterpret_cast<void**>(targets + i));
+    }
+  }
+}
+
 inline void
 mark(Thread* t, object& target)
 {