diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
index 4b248f5efca2a..acca5c5363fac 100644
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -585,6 +585,7 @@ struct AISettingsWindow : public Window {
 	virtual void OnInvalidateData(int data = 0, bool gui_scope = true)
 	{
 		this->RebuildVisibleSettings();
+		DeleteChildWindows(WC_QUERY_STRING);
 	}
 };