diff --git a/src/Preferences.cs b/src/Preferences.cs
index ed7834b..e832ba9 100644
--- a/src/Preferences.cs
+++ b/src/Preferences.cs
@@ -145,6 +145,11 @@ namespace FSpot
 			case VIEWER_SHOW_FILENAMES:
 				return true;
 			
+			case VIEWER_WIDTH:
+				return 640;
+			case VIEWER_HEIGHT:
+				return 480;
+
 			case TAG_ICON_SIZE:
 				return (int) Tag.IconSize.Medium;
 		
