diff --git a/src/Android/Perspex.Android/SystemDialogImpl.cs b/src/Android/Perspex.Android/SystemDialogImpl.cs
index 60f9de914c..d60fad8230 100644
--- a/src/Android/Perspex.Android/SystemDialogImpl.cs
+++ b/src/Android/Perspex.Android/SystemDialogImpl.cs
@@ -12,5 +12,10 @@ namespace Perspex.Android
         {
             throw new NotImplementedException();
         }
+
+        public Task<string> ShowFolderDialogAsync(OpenFolderDialog dialog, IWindowImpl parent)
+        {
+            throw new NotImplementedException();
+        }
     }
 }
\ No newline at end of file
diff --git a/src/Gtk/Perspex.Gtk/SystemDialogImpl.cs b/src/Gtk/Perspex.Gtk/SystemDialogImpl.cs
index 869bd2eb70..304de86fc3 100644
--- a/src/Gtk/Perspex.Gtk/SystemDialogImpl.cs
+++ b/src/Gtk/Perspex.Gtk/SystemDialogImpl.cs
@@ -53,5 +53,10 @@ namespace Perspex.Gtk
             dlg.Show();
             return tcs.Task;
         }
+
+        public Task<string> ShowFolderDialogAsync(OpenFolderDialog dialog, IWindowImpl parent)
+        {
+            throw new NotImplementedException();
+        }
     }
 }