diff --git a/src/settings_gui.cpp b/src/settings_gui.cpp
--- a/src/settings_gui.cpp
+++ b/src/settings_gui.cpp
@@ -538,24 +538,32 @@ struct GameOptionsWindow : Window {
 				}
 				break;
 
-			case WID_GO_GUI_ZOOM_DROPDOWN:
-				GfxClearSpriteCache();
-				_gui_zoom_cfg = index > 0 ? ZOOM_LVL_OUT_4X - index + 1 : ZOOM_LVL_CFG_AUTO;
-				UpdateGUIZoom();
-				UpdateCursorSize();
-				UpdateAllVirtCoords();
-				FixTitleGameZoom();
-				ReInitAllWindows();
+			case WID_GO_GUI_ZOOM_DROPDOWN: {
+				int8 new_zoom = index > 0 ? ZOOM_LVL_OUT_4X - index + 1 : ZOOM_LVL_CFG_AUTO;
+				if (new_zoom != _gui_zoom_cfg) {
+					GfxClearSpriteCache();
+					_gui_zoom_cfg = new_zoom;
+					UpdateGUIZoom();
+					UpdateCursorSize();
+					UpdateAllVirtCoords();
+					FixTitleGameZoom();
+					ReInitAllWindows();
+				}
 				break;
+			}
 
-			case WID_GO_FONT_ZOOM_DROPDOWN:
-				GfxClearSpriteCache();
-				_font_zoom_cfg = index > 0 ? ZOOM_LVL_OUT_4X - index + 1 : ZOOM_LVL_CFG_AUTO;
-				UpdateGUIZoom();
-				ClearFontCache();
-				LoadStringWidthTable();
-				UpdateAllVirtCoords();
+			case WID_GO_FONT_ZOOM_DROPDOWN: {
+				int8 new_zoom = index > 0 ? ZOOM_LVL_OUT_4X - index + 1 : ZOOM_LVL_CFG_AUTO;
+				if (new_zoom != _font_zoom_cfg) {
+					GfxClearSpriteCache();
+					_font_zoom_cfg = new_zoom;
+					UpdateGUIZoom();
+					ClearFontCache();
+					LoadStringWidthTable();
+					UpdateAllVirtCoords();
+				}
 				break;
+			}
 
 			case WID_GO_BASE_GRF_DROPDOWN:
 				this->SetMediaSet<BaseGraphics>(index);