diff --git a/src/libs/icon/generic/VertexSource.h b/src/libs/icon/generic/VertexSource.h
index 3c1c9d0ded..7eda69f81f 100644
--- a/src/libs/icon/generic/VertexSource.h
+++ b/src/libs/icon/generic/VertexSource.h
@@ -27,6 +27,17 @@ class VertexSource {
 	/*! Determines whether open paths should be closed or left open. */
 	virtual	bool				WantsOpenPaths() const = 0;
 	virtual	double				ApproximationScale() const = 0;
+
+ private:
+	// Not allowed
+#if __GNUC__ <= 2
+#define NOT_ALLOWED
+#else
+#define NOT_ALLOWED = delete
+#endif
+	VertexSource(const VertexSource& other) NOT_ALLOWED;
+	VertexSource& operator=(const VertexSource& other) NOT_ALLOWED;
+#undef NOT_ALLOWED
 };
 
 
diff --git a/src/libs/icon/transformer/AffineTransformer.cpp b/src/libs/icon/transformer/AffineTransformer.cpp
index 2d7d3fb088..b0b32ac523 100644
--- a/src/libs/icon/transformer/AffineTransformer.cpp
+++ b/src/libs/icon/transformer/AffineTransformer.cpp
@@ -61,7 +61,7 @@ AffineTransformer::~AffineTransformer()
 Transformer*
 AffineTransformer::Clone() const
 {
-	AffineTransformer* clone = new (nothrow) AffineTransformer(fSource);
+	AffineTransformer* clone = new (nothrow) AffineTransformer(*fSource);
 	if (clone)
 		clone->multiply(*this);
 	return clone;
@@ -93,7 +93,7 @@ AffineTransformer::SetSource(VertexSource& source)
 double
 AffineTransformer::ApproximationScale() const
 {
-	return fabs(fSource.ApproximationScale() * scale());
+	return fabs(fSource->ApproximationScale() * scale());
 }
 
 // #pragma mark -
diff --git a/src/libs/icon/transformer/ContourTransformer.cpp b/src/libs/icon/transformer/ContourTransformer.cpp
index a569513f45..7fd32081d4 100644
--- a/src/libs/icon/transformer/ContourTransformer.cpp
+++ b/src/libs/icon/transformer/ContourTransformer.cpp
@@ -73,7 +73,7 @@ ContourTransformer::~ContourTransformer()
 Transformer*
 ContourTransformer::Clone() const
 {
-	ContourTransformer* clone = new (nothrow) ContourTransformer(fSource);
+	ContourTransformer* clone = new (nothrow) ContourTransformer(*fSource);
 	if (clone) {
 		clone->line_join(line_join());
 		clone->inner_join(inner_join());
@@ -111,7 +111,7 @@ ContourTransformer::SetSource(VertexSource& source)
 double
 ContourTransformer::ApproximationScale() const
 {
-	double scale = fSource.ApproximationScale();
+	double scale = fSource->ApproximationScale();
 	double factor = fabs(width());
 	if (factor > 1.0)
 		scale *= factor;
diff --git a/src/libs/icon/transformer/PathTransformer.h b/src/libs/icon/transformer/PathTransformer.h
index eb75be76e9..0be9e02737 100644
--- a/src/libs/icon/transformer/PathTransformer.h
+++ b/src/libs/icon/transformer/PathTransformer.h
@@ -24,25 +24,25 @@ class PathTransformer : public VertexSource
 {
 public:
 								PathTransformer(VertexSource& source)
-									: fSource(source) {}
+									: fSource(&source) {}
 	virtual						~PathTransformer() {}
 
 	// PathTransformer
 	virtual	void				rewind(unsigned path_id)
-									{ fSource.rewind(path_id); }
+									{ fSource->rewind(path_id); }
     virtual	unsigned			vertex(double* x, double* y)
-									{ return fSource.vertex(x, y); }
+									{ return fSource->vertex(x, y); }
 
 	virtual	void				SetSource(VertexSource& source)
-									{ fSource = source; }
+									{ fSource = &source; }
 
 	virtual	bool				WantsOpenPaths() const
-									{ return fSource.WantsOpenPaths(); }
+									{ return fSource->WantsOpenPaths(); }
 	virtual	double				ApproximationScale() const
-									{ return fSource.ApproximationScale(); }
+									{ return fSource->ApproximationScale(); }
 
 protected:
-			VertexSource&		fSource;
+			VertexSource*		fSource;
 };
 
 
diff --git a/src/libs/icon/transformer/PerspectiveTransformer.cpp b/src/libs/icon/transformer/PerspectiveTransformer.cpp
index f4659c846f..60ba8328d2 100644
--- a/src/libs/icon/transformer/PerspectiveTransformer.cpp
+++ b/src/libs/icon/transformer/PerspectiveTransformer.cpp
@@ -76,8 +76,8 @@ PerspectiveTransformer::PerspectiveTransformer(const PerspectiveTransformer& oth
 #else
 	: Transformer(""),
 #endif
-	  PathTransformer(other.fSource),
-	  Perspective(fSource, *this),
+	  PathTransformer(*other.fSource),
+	  Perspective(*fSource, *this),
 	  fShape(other.fShape)
 #ifdef ICON_O_MATIC
 	, fInverted(other.fInverted),
@@ -162,7 +162,7 @@ PerspectiveTransformer::SetSource(VertexSource& source)
 double
 PerspectiveTransformer::ApproximationScale() const
 {
-	return fSource.ApproximationScale() * scale();
+	return fSource->ApproximationScale() * scale();
 }
 
 
@@ -223,7 +223,7 @@ PerspectiveTransformer::ObjectChanged(const Observable* object)
 	uint32 pathID[1];
 	pathID[0] = 0;
 	double left, top, right, bottom;
-	agg::bounding_rect(fSource, pathID, 0, 1, &left, &top, &right, &bottom);
+	agg::bounding_rect(*fSource, pathID, 0, 1, &left, &top, &right, &bottom);
 	BRect newFromBox = BRect(left, top, right, bottom);
 
 	// Stop if nothing we care about has changed
diff --git a/src/libs/icon/transformer/StrokeTransformer.cpp b/src/libs/icon/transformer/StrokeTransformer.cpp
index 4ef926ea24..0b03098569 100644
--- a/src/libs/icon/transformer/StrokeTransformer.cpp
+++ b/src/libs/icon/transformer/StrokeTransformer.cpp
@@ -76,7 +76,7 @@ StrokeTransformer::~StrokeTransformer()
 Transformer*
 StrokeTransformer::Clone() const
 {
-	StrokeTransformer* clone = new (nothrow) StrokeTransformer(fSource);
+	StrokeTransformer* clone = new (nothrow) StrokeTransformer(*fSource);
 	if (clone) {
 		clone->line_cap(line_cap());
 		clone->line_join(line_join());
@@ -122,7 +122,7 @@ StrokeTransformer::WantsOpenPaths() const
 double
 StrokeTransformer::ApproximationScale() const
 {
-	double scale = fSource.ApproximationScale();
+	double scale = fSource->ApproximationScale();
 	double factor = fabs(width());
 	if (factor > 1.0)
 		scale *= factor;