diff --git a/src/Perspex.Application/Designer/DesignerApi.cs b/src/Perspex.Application/Designer/DesignerApi.cs
index aebc621786..4a172af87b 100644
--- a/src/Perspex.Application/Designer/DesignerApi.cs
+++ b/src/Perspex.Application/Designer/DesignerApi.cs
@@ -5,7 +5,7 @@ using System.Runtime.CompilerServices;
 using System.Text;
 using System.Threading.Tasks;
 
-namespace Perspex.Designer
+namespace Perspex.DesignerSupport
 {
     class DesignerApi
     {
diff --git a/src/Perspex.Application/Designer/DesignerAssist.cs b/src/Perspex.Application/Designer/DesignerAssist.cs
index 778905058e..3228408087 100644
--- a/src/Perspex.Application/Designer/DesignerAssist.cs
+++ b/src/Perspex.Application/Designer/DesignerAssist.cs
@@ -10,7 +10,7 @@ using Perspex.Controls.Platform;
 using Perspex.Markup.Xaml;
 using Perspex.Themes.Default;
 
-namespace Perspex.Designer
+namespace Perspex.DesignerSupport
 {
     class DesignerAssist
     {
diff --git a/src/Windows/Perspex.Designer/AppHost/PerspexAppHost.cs b/src/Windows/Perspex.Designer/AppHost/PerspexAppHost.cs
index 24eef4ad33..7cd020e249 100644
--- a/src/Windows/Perspex.Designer/AppHost/PerspexAppHost.cs
+++ b/src/Windows/Perspex.Designer/AppHost/PerspexAppHost.cs
@@ -12,6 +12,7 @@ using Perspex.Designer.Comm;
 using Perspex.Designer.InProcDesigner;
 using Perspex.Designer.Metadata;
 using Timer = System.Windows.Forms.Timer;
+using Perspex.DesignerSupport;
 
 namespace Perspex.Designer.AppHost
 {
@@ -201,7 +202,7 @@ namespace Perspex.Designer.AppHost
             log("Initializing built-in designer");
             var dic = new Dictionary<string, object>();
             Api = new DesignerApi(dic) {OnResize = OnResize, OnWindowCreated = OnWindowCreated};
-            LookupStaticMethod("Perspex.Designer.DesignerAssist", "Init").Invoke(null, new object[] {dic});
+            LookupStaticMethod("Perspex.DesignerSupport.DesignerAssist", "Init").Invoke(null, new object[] {dic});
 
             _window = new Control
             {