diff --git a/src/Gui/Gui.cs b/src/Gui/Gui.cs
index 58e5871..0858fb7 100644
--- a/src/Gui/Gui.cs
+++ b/src/Gui/Gui.cs
@@ -89,15 +89,18 @@ namespace WorldOfPeacecraft
 
 		public void PerformRefresh ()
 		{
-			ITile[,] map = Backend.GetMap();
-			int mapWidth = (map.GetLength(0)) * tileSize;
-			int mapHeight = (map.GetLength(1)) * tileSize;
-			this.SuspendLayout();
-			this.SetClientSizeCore(mapWidth, mapHeight);
-			Board.Size = new Size(mapWidth, mapHeight);
-			this.ResumeLayout();
-			this.PerformLayout();
-			this.Refresh();
+			this.BeginInvoke(new MethodInvoker(delegate
+			{
+				ITile[,] map = Backend.GetMap();
+				int mapWidth = (map.GetLength(0)) * tileSize;
+				int mapHeight = (map.GetLength(1)) * tileSize;
+				this.SuspendLayout();
+				this.SetClientSizeCore(mapWidth, mapHeight);
+				Board.Size = new Size(mapWidth, mapHeight);
+				this.ResumeLayout();
+				this.PerformLayout();
+				this.Refresh();
+			}));
 		}
 
 		[DllImport("kernel32.dll", SetLastError = true)]