diff --git a/iOS/Shared/BoardThumbnailImage.swift b/iOS/Shared/BoardThumbnailImage.swift
index c58393b..2f19599 100644
--- a/iOS/Shared/BoardThumbnailImage.swift
+++ b/iOS/Shared/BoardThumbnailImage.swift
@@ -41,10 +41,12 @@ struct BoardThumbnailImage: View {
     }
 
     private var thumbnailImage: UIImage {
-        guard let key = cacheKey else {
+        guard let cacheKey = cacheKey else {
             return renderImage()
         }
         
+        let key = "\(cacheKey)-\(fillColor.hashValue)-\(gridColor.hashValue)"
+        
         if let image = cacheStorage.value(forKey: key) {
             return image
         } else {