diff --git a/modules/juce_core/containers/juce_ArrayBase.h b/modules/juce_core/containers/juce_ArrayBase.h
index d706858600..39acf48884 100644
--- a/modules/juce_core/containers/juce_ArrayBase.h
+++ b/modules/juce_core/containers/juce_ArrayBase.h
@@ -230,7 +230,7 @@ public:
     }
 
     template <class OtherArrayType>
-    typename std::enable_if<! std::is_pointer<OtherArrayType>::value, void>::type
+    typename std::enable_if<! std::is_pointer<OtherArrayType>::value, int>::type
     addArray (const OtherArrayType& arrayToAddFrom,
               int startIndex, int numElementsToAdd = -1)
     {
@@ -244,6 +244,8 @@ public:
             numElementsToAdd = (int) arrayToAddFrom.size() - startIndex;
 
         addArray (arrayToAddFrom.data() + startIndex, numElementsToAdd);
+
+        return numElementsToAdd;
     }
 
     //==============================================================================
diff --git a/modules/juce_core/containers/juce_ReferenceCountedArray.cpp b/modules/juce_core/containers/juce_ReferenceCountedArray.cpp
new file mode 100644
index 0000000000..7660045747
--- /dev/null
+++ b/modules/juce_core/containers/juce_ReferenceCountedArray.cpp
@@ -0,0 +1,76 @@
+/*
+  ==============================================================================
+
+   This file is part of the JUCE library.
+   Copyright (c) 2018 - ROLI Ltd.
+
+   JUCE is an open source library subject to commercial or open-source
+   licensing.
+
+   The code included in this file is provided under the terms of the ISC license
+   http://www.isc.org/downloads/software-support-policy/isc-license. Permission
+   To use, copy, modify, and/or distribute this software for any purpose with or
+   without fee is hereby granted provided that the above copyright notice and
+   this permission notice appear in all copies.
+
+   JUCE IS PROVIDED "AS IS" WITHOUT ANY WARRANTY, AND ALL WARRANTIES, WHETHER
+   EXPRESSED OR IMPLIED, INCLUDING MERCHANTABILITY AND FITNESS FOR PURPOSE, ARE
+   DISCLAIMED.
+
+  ==============================================================================
+*/
+
+namespace juce
+{
+
+#if JUCE_UNIT_TESTS
+
+class ReferenceCountedArrayTests   : public UnitTest
+{
+public:
+    ReferenceCountedArrayTests() : UnitTest ("ReferenceCountedArray", "Containers") {}
+
+    //==============================================================================
+    void runTest() override
+    {
+        beginTest ("Add derived objects");
+        {
+            derivedObjects.add (static_cast<TestDerivedObj*> (new TestBaseObj()));
+            expectEquals (derivedObjects.size(), 1);
+            expectEquals (derivedObjects.getObjectPointer (0)->getReferenceCount(), 1);
+            expectEquals (derivedObjects[0]->getReferenceCount(), 2);
+
+            for (auto o : derivedObjects)
+                expectEquals (o->getReferenceCount(), 1);
+
+            for (auto o : getObjects())
+                expectEquals (o->getReferenceCount(), 2);
+        }
+    }
+
+private:
+    struct TestBaseObj : public ReferenceCountedObject
+    {
+        TestBaseObj() = default;
+    };
+
+    struct TestDerivedObj : public TestBaseObj
+    {
+        TestDerivedObj() = default;
+    };
+
+    ReferenceCountedArray<TestDerivedObj> derivedObjects;
+
+    ReferenceCountedArray<TestBaseObj> getObjects() const
+    {
+        ReferenceCountedArray<TestBaseObj> objects;
+        objects.addArray (derivedObjects);
+        return objects;
+    }
+};
+
+static ReferenceCountedArrayTests referenceCountedArrayTests;
+
+#endif
+
+} // namespace juce
diff --git a/modules/juce_core/containers/juce_ReferenceCountedArray.h b/modules/juce_core/containers/juce_ReferenceCountedArray.h
index 02d2ba152d..3b2a886077 100644
--- a/modules/juce_core/containers/juce_ReferenceCountedArray.h
+++ b/modules/juce_core/containers/juce_ReferenceCountedArray.h
@@ -62,7 +62,7 @@ public:
     ReferenceCountedArray (const ReferenceCountedArray& other) noexcept
     {
         const ScopedLockType lock (other.getLock());
-        values.addArray (other.values.begin(), other.values.size());
+        values.addArray (other.begin(), other.size());
 
         for (auto* o : *this)
             if (o != nullptr)
@@ -80,7 +80,6 @@ public:
     ReferenceCountedArray (const ReferenceCountedArray<OtherObjectClass, OtherCriticalSection>& other) noexcept
     {
         const typename ReferenceCountedArray<OtherObjectClass, OtherCriticalSection>::ScopedLockType lock (other.getLock());
-
         values.addArray (other.begin(), other.size());
 
         for (auto* o : *this)
@@ -466,11 +465,11 @@ public:
         {
             const ScopedLockType lock2 (getLock());
 
-            values.addArray (arrayToAddFrom.values, startIndex, numElementsToAdd);
-            auto newSize = values.size();
+            auto numElementsAdded = values.addArray (arrayToAddFrom.values, startIndex, numElementsToAdd);
+            auto** e = values.end();
 
-            for (int i = newSize - numElementsToAdd; i < newSize; ++i)
-                values[i]->incReferenceCount();
+            for (int i = 0; i < numElementsAdded; ++i)
+                (*(--e))->incReferenceCount();
         }
     }
 
diff --git a/modules/juce_core/juce_core.cpp b/modules/juce_core/juce_core.cpp
index 1a174b1020..9cf231dc34 100644
--- a/modules/juce_core/juce_core.cpp
+++ b/modules/juce_core/juce_core.cpp
@@ -119,6 +119,7 @@
 //==============================================================================
 #include "containers/juce_AbstractFifo.cpp"
 #include "containers/juce_ArrayBase.cpp"
+#include "containers/juce_ReferenceCountedArray.cpp"
 #include "containers/juce_NamedValueSet.cpp"
 #include "containers/juce_PropertySet.cpp"
 #include "containers/juce_SparseSet.cpp"