diff --git a/src/fetch.ts b/src/fetch.ts
index 827670e..72c6fe8 100644
--- a/src/fetch.ts
+++ b/src/fetch.ts
@@ -62,7 +62,9 @@ export function contextFetch(context: Context, options: ContextFetchOptions) {
     // cache bypass so we dont have CORS issues with cached images
     // ref: https://developer.mozilla.org/en/docs/Web/API/XMLHttpRequest/Using_XMLHttpRequest#Bypassing_the_cache
     if (bypassingCache) {
-      url += (/\?/.test(url) ? '&' : '?') + new Date().getTime()
+      if (bypassingCache instanceof RegExp && bypassingCache.test(url)) {
+        url += (/\?/.test(url) ? '&' : '?') + new Date().getTime()
+      }
     }
 
     const baseFetchOptions: BaseFetchOptions = {
diff --git a/src/options.ts b/src/options.ts
index b11bdc6..8df9e27 100644
--- a/src/options.ts
+++ b/src/options.ts
@@ -88,7 +88,7 @@ export interface Options {
      *
      * default: false
      */
-    bypassingCache?: boolean
+    bypassingCache?: boolean | RegExp
 
     /**
      * A data URL for a placeholder image that will be used when fetching