diff --git a/include/S3DVertex.h b/include/S3DVertex.h
index 3d78e20..aba81a7 100644
--- a/include/S3DVertex.h
+++ b/include/S3DVertex.h
@@ -25,7 +25,7 @@ enum E_VERTEX_TYPE
 	EVT_2TCOORDS,
 
 	//! Vertex with a tangent and binormal vector, video::S3DVertexTangents.
-	/** Usually used for tangent space normal mapping. 
+	/** Usually used for tangent space normal mapping.
 		Usually tangent and binormal get send to shaders as texture coordinate sets 1 and 2.
 	*/
 	EVT_TANGENTS
@@ -150,21 +150,21 @@ struct S3DVertex2TCoords : public S3DVertex
 	//! Equality operator
 	bool operator==(const S3DVertex2TCoords& other) const
 	{
-		return ((static_cast<S3DVertex>(*this)==other) &&
+		return ((static_cast<S3DVertex>(*this)==static_cast<const S3DVertex&>(other)) &&
 			(TCoords2 == other.TCoords2));
 	}
 
 	//! Inequality operator
 	bool operator!=(const S3DVertex2TCoords& other) const
 	{
-		return ((static_cast<S3DVertex>(*this)!=other) ||
+		return ((static_cast<S3DVertex>(*this)!=static_cast<const S3DVertex&>(other)) ||
 			(TCoords2 != other.TCoords2));
 	}
 
 	bool operator<(const S3DVertex2TCoords& other) const
 	{
 		return ((static_cast<S3DVertex>(*this) < other) ||
-				((static_cast<S3DVertex>(*this) == other) && (TCoords2 < other.TCoords2)));
+				((static_cast<S3DVertex>(*this) == static_cast<const S3DVertex&>(other)) && (TCoords2 < other.TCoords2)));
 	}
 
 	static E_VERTEX_TYPE getType()
@@ -186,7 +186,7 @@ struct S3DVertex2TCoords : public S3DVertex
 
 
 //! Vertex with a tangent and binormal vector.
-/** Usually used for tangent space normal mapping. 
+/** Usually used for tangent space normal mapping.
 	Usually tangent and binormal get send to shaders as texture coordinate sets 1 and 2.
 */
 struct S3DVertexTangents : public S3DVertex
@@ -225,14 +225,14 @@ struct S3DVertexTangents : public S3DVertex
 
 	bool operator==(const S3DVertexTangents& other) const
 	{
-		return ((static_cast<S3DVertex>(*this)==other) &&
+		return ((static_cast<S3DVertex>(*this)==static_cast<const S3DVertex&>(other)) &&
 			(Tangent == other.Tangent) &&
 			(Binormal == other.Binormal));
 	}
 
 	bool operator!=(const S3DVertexTangents& other) const
 	{
-		return ((static_cast<S3DVertex>(*this)!=other) ||
+		return ((static_cast<S3DVertex>(*this)!=static_cast<const S3DVertex&>(other)) ||
 			(Tangent != other.Tangent) ||
 			(Binormal != other.Binormal));
 	}
@@ -240,8 +240,8 @@ struct S3DVertexTangents : public S3DVertex
 	bool operator<(const S3DVertexTangents& other) const
 	{
 		return ((static_cast<S3DVertex>(*this) < other) ||
-				((static_cast<S3DVertex>(*this) == other) && (Tangent < other.Tangent)) ||
-				((static_cast<S3DVertex>(*this) == other) && (Tangent == other.Tangent) && (Binormal < other.Binormal)));
+				((static_cast<S3DVertex>(*this) == static_cast<const S3DVertex&>(other)) && (Tangent < other.Tangent)) ||
+				((static_cast<S3DVertex>(*this) == static_cast<const S3DVertex&>(other)) && (Tangent == other.Tangent) && (Binormal < other.Binormal)));
 	}
 
 	static E_VERTEX_TYPE getType()