diff --git a/Source/SharpDX/Size2.cs b/Source/SharpDX/Size2.cs
index 2b75ce1b5..09ae59a8a 100644
--- a/Source/SharpDX/Size2.cs
+++ b/Source/SharpDX/Size2.cs
@@ -75,8 +75,9 @@ public bool Equals(Size2 other)
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
-            if (obj.GetType() != typeof(Size2)) return false;
+            if (!(obj is Size2))
+                return false;
+
             return Equals((Size2)obj);
         }
 
diff --git a/Source/SharpDX/Size2F.cs b/Source/SharpDX/Size2F.cs
index 8d64ee849..091bb1659 100644
--- a/Source/SharpDX/Size2F.cs
+++ b/Source/SharpDX/Size2F.cs
@@ -75,8 +75,9 @@ public bool Equals(Size2F other)
         /// <inheritdoc/>
         public override bool Equals(object obj)
         {
-            if (ReferenceEquals(null, obj)) return false;
-            if (obj.GetType() != typeof(Size2F)) return false;
+            if (!(obj is Size2F))
+                return false;
+
             return Equals((Size2F)obj);
         }