diff --git a/src/Avalonia.Controls/Shapes/Ellipse.cs b/src/Avalonia.Controls/Shapes/Ellipse.cs
index 8cb73bf5c6..f80bf5d967 100644
--- a/src/Avalonia.Controls/Shapes/Ellipse.cs
+++ b/src/Avalonia.Controls/Shapes/Ellipse.cs
@@ -14,7 +14,7 @@ namespace Avalonia.Controls.Shapes
 
         protected override Geometry CreateDefiningGeometry()
         {
-            var rect = new Rect(Bounds.Size).Deflate(StrokeThickness);
+            var rect = new Rect(Bounds.Size).Deflate(StrokeThickness / 2);
             return new EllipseGeometry(rect);
         }
 
diff --git a/src/Avalonia.Controls/Shapes/Rectangle.cs b/src/Avalonia.Controls/Shapes/Rectangle.cs
index 375b0b719a..b803bde588 100644
--- a/src/Avalonia.Controls/Shapes/Rectangle.cs
+++ b/src/Avalonia.Controls/Shapes/Rectangle.cs
@@ -14,7 +14,7 @@ namespace Avalonia.Controls.Shapes
 
         protected override Geometry CreateDefiningGeometry()
         {
-            var rect = new Rect(Bounds.Size).Deflate(StrokeThickness);
+            var rect = new Rect(Bounds.Size).Deflate(StrokeThickness / 2);
             return new RectangleGeometry(rect);
         }
 
diff --git a/src/Avalonia.Visuals/Rect.cs b/src/Avalonia.Visuals/Rect.cs
index 530a47729f..49d4724b9a 100644
--- a/src/Avalonia.Visuals/Rect.cs
+++ b/src/Avalonia.Visuals/Rect.cs
@@ -256,7 +256,7 @@ namespace Avalonia
         /// <summary>
         /// Inflates the rectangle.
         /// </summary>
-        /// <param name="thickness">The thickness.</param>
+        /// <param name="thickness">The thickness to be subtracted for each side of the rectangle.</param>
         /// <returns>The inflated rectangle.</returns>
         public Rect Inflate(double thickness)
         {
@@ -266,7 +266,7 @@ namespace Avalonia
         /// <summary>
         /// Inflates the rectangle.
         /// </summary>
-        /// <param name="thickness">The thickness.</param>
+        /// <param name="thickness">The thickness to be subtracted for each side of the rectangle.</param>
         /// <returns>The inflated rectangle.</returns>
         public Rect Inflate(Thickness thickness)
         {
@@ -278,20 +278,18 @@ namespace Avalonia
         /// <summary>
         /// Deflates the rectangle.
         /// </summary>
-        /// <param name="thickness">The thickness.</param>
+        /// <param name="thickness">The thickness to be subtracted for each side of the rectangle.</param>
         /// <returns>The deflated rectangle.</returns>
-        /// <remarks>The deflated rectangle size cannot be less than 0.</remarks>
         public Rect Deflate(double thickness)
         {
-            return Deflate(new Thickness(thickness / 2));
+            return Deflate(new Thickness(thickness));
         }
 
         /// <summary>
         /// Deflates the rectangle by a <see cref="Thickness"/>.
         /// </summary>
-        /// <param name="thickness">The thickness.</param>
+        /// <param name="thickness">The thickness to be subtracted for each side of the rectangle.</param>
         /// <returns>The deflated rectangle.</returns>
-        /// <remarks>The deflated rectangle size cannot be less than 0.</remarks>
         public Rect Deflate(Thickness thickness)
         {
             return new Rect(
diff --git a/tests/Avalonia.RenderTests/Controls/CustomRenderTests.cs b/tests/Avalonia.RenderTests/Controls/CustomRenderTests.cs
index 6a01536b12..d3a935c281 100644
--- a/tests/Avalonia.RenderTests/Controls/CustomRenderTests.cs
+++ b/tests/Avalonia.RenderTests/Controls/CustomRenderTests.cs
@@ -36,7 +36,7 @@ namespace Avalonia.Direct2D1.RenderTests.Controls
                         new Rect(control.Bounds.Size),
                         4);
 
-                    using (context.PushClip(new Rect(control.Bounds.Size).Deflate(20)))
+                    using (context.PushClip(new Rect(control.Bounds.Size).Deflate(10)))
                     {
                         context.FillRectangle(
                             Brushes.Blue,
@@ -100,7 +100,7 @@ namespace Avalonia.Direct2D1.RenderTests.Controls
                     {
                         context.FillRectangle(
                             Brushes.Blue,
-                            new Rect(control.Bounds.Size).Deflate(20),
+                            new Rect(control.Bounds.Size).Deflate(10),
                             4);
                     }
                 }),
@@ -140,7 +140,7 @@ namespace Avalonia.Direct2D1.RenderTests.Controls
                     {
                         context.FillRectangle(
                             Brushes.Blue,
-                            new Rect(control.Bounds.Size).Deflate(20),
+                            new Rect(control.Bounds.Size).Deflate(10),
                             4);
                     }
                 }),