diff --git a/modules/juce_core/memory/juce_ReferenceCountedObject.h b/modules/juce_core/memory/juce_ReferenceCountedObject.h
index 12e2f3afc7..b1d1a8629f 100644
--- a/modules/juce_core/memory/juce_ReferenceCountedObject.h
+++ b/modules/juce_core/memory/juce_ReferenceCountedObject.h
@@ -116,6 +116,8 @@ protected:
 private:
     //==============================================================================
     Atomic <int> refCount;
+
+    JUCE_DECLARE_NON_COPYABLE (ReferenceCountedObject)
 };
 
 
@@ -175,6 +177,8 @@ protected:
 private:
     //==============================================================================
     int refCount;
+
+    JUCE_DECLARE_NON_COPYABLE (SingleThreadedReferenceCountedObject)
 };
 
 
diff --git a/modules/juce_data_structures/values/juce_ValueTree.cpp b/modules/juce_data_structures/values/juce_ValueTree.cpp
index a16337549e..f9362524d6 100644
--- a/modules/juce_data_structures/values/juce_ValueTree.cpp
+++ b/modules/juce_data_structures/values/juce_ValueTree.cpp
@@ -28,13 +28,13 @@ class ValueTree::SharedObject  : public ReferenceCountedObject
 public:
     typedef ReferenceCountedObjectPtr<SharedObject> Ptr;
 
-    explicit SharedObject (const Identifier& type_) noexcept
-        : type (type_), parent (nullptr)
+    explicit SharedObject (const Identifier& t) noexcept
+        : type (t), parent (nullptr)
     {
     }
 
     SharedObject (const SharedObject& other)
-        : ReferenceCountedObject (other),
+        : ReferenceCountedObject(),
           type (other.type), properties (other.properties), parent (nullptr)
     {
         for (int i = 0; i < other.children.size(); ++i)
diff --git a/modules/juce_graphics/fonts/juce_Font.cpp b/modules/juce_graphics/fonts/juce_Font.cpp
index dff5b091da..839cfdd1d9 100644
--- a/modules/juce_graphics/fonts/juce_Font.cpp
+++ b/modules/juce_graphics/fonts/juce_Font.cpp
@@ -216,7 +216,7 @@ public:
     }
 
     SharedFontInternal (const SharedFontInternal& other) noexcept
-        : ReferenceCountedObject (other),
+        : ReferenceCountedObject(),
           typefaceName (other.typefaceName),
           typefaceStyle (other.typefaceStyle),
           height (other.height),
diff --git a/modules/juce_graphics/native/juce_RenderingHelpers.h b/modules/juce_graphics/native/juce_RenderingHelpers.h
index 9ea92c99cf..5d591076fa 100644
--- a/modules/juce_graphics/native/juce_RenderingHelpers.h
+++ b/modules/juce_graphics/native/juce_RenderingHelpers.h
@@ -1578,7 +1578,7 @@ namespace ClipRegions
         EdgeTableRegion (const Rectangle<float>& r) : edgeTable (r) {}
         EdgeTableRegion (const RectangleList& r)    : edgeTable (r) {}
         EdgeTableRegion (const Rectangle<int>& bounds, const Path& p, const AffineTransform& t) : edgeTable (bounds, p, t) {}
-        EdgeTableRegion (const EdgeTableRegion& other) : Base (other), edgeTable (other.edgeTable) {}
+        EdgeTableRegion (const EdgeTableRegion& other) : Base(), edgeTable (other.edgeTable) {}
 
         Ptr clone() const                           { return new EdgeTableRegion (*this); }
         Ptr applyClipTo (const Ptr& target) const   { return target->clipToEdgeTable (edgeTable); }
@@ -1774,7 +1774,7 @@ namespace ClipRegions
     public:
         RectangleListRegion (const Rectangle<int>& r) : clip (r) {}
         RectangleListRegion (const RectangleList& r)  : clip (r) {}
-        RectangleListRegion (const RectangleListRegion& other) : Base (other), clip (other.clip) {}
+        RectangleListRegion (const RectangleListRegion& other) : Base(), clip (other.clip) {}
 
         Ptr clone() const                           { return new RectangleListRegion (*this); }
         Ptr applyClipTo (const Ptr& target) const   { return target->clipToRectangleList (clip); }