diff --git a/src/ai/ai_gui.cpp b/src/ai/ai_gui.cpp
--- a/src/ai/ai_gui.cpp
+++ b/src/ai/ai_gui.cpp
@@ -1431,7 +1431,7 @@ StringFilter AIDebugWindow::break_string
 /** Make a number of rows with buttons for each company for the AI debug window. */
 NWidgetBase *MakeCompanyButtonRowsAIDebug(int *biggest_index)
 {
-	return MakeCompanyButtonRows(biggest_index, WID_AID_COMPANY_BUTTON_START, WID_AID_COMPANY_BUTTON_END, 8, STR_AI_DEBUG_SELECT_AI_TOOLTIP);
+	return MakeCompanyButtonRows(biggest_index, WID_AID_COMPANY_BUTTON_START, WID_AID_COMPANY_BUTTON_END, COLOUR_GREY, 8, STR_AI_DEBUG_SELECT_AI_TOOLTIP);
 }
 
 /**