diff --git a/php/assets/room-icons.php b/php/assets/room-icons.php
index 477b7aa..b2cf95d 100644
--- a/php/assets/room-icons.php
+++ b/php/assets/room-icons.php
@@ -22,7 +22,7 @@
 	 */
 	function room_icon_path_resized(string $room_id, string $size): string {
 		global $ROOM_ICONS;
-		return "$ROOM_ICONS/$room_id-$size";
+		return "$ROOM_ICONS/$room_id-$size.webp";
 	}
 
 	/**
@@ -32,7 +32,7 @@
 	 */
 	function room_icon_path_relative(string $room_id, string $size): string {
 		global $ROOM_ICONS_RELATIVE;
-		return "$ROOM_ICONS_RELATIVE/$room_id-$size";
+		return "$ROOM_ICONS_RELATIVE/$room_id-$size.webp";
 	}
 
 	/**