diff --git a/src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/CompletionWindow/AbstractCompletionWindow.cs b/src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/CompletionWindow/AbstractCompletionWindow.cs
index b20b72ec3e..94ae8d670b 100644
--- a/src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/CompletionWindow/AbstractCompletionWindow.cs
+++ b/src/Libraries/ICSharpCode.TextEditor/Project/Src/Gui/CompletionWindow/AbstractCompletionWindow.cs
@@ -41,6 +41,7 @@ namespace ICSharpCode.TextEditor.Gui.CompletionWindow
 			StartPosition   = FormStartPosition.Manual;
 			FormBorderStyle = FormBorderStyle.None;
 			ShowInTaskbar   = false;
+			MinimumSize     = new Size(1, 1);
 			Size            = new Size(1, 1);
 		}