diff --git a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
index 9d2ecf29c..06c8bec3a 100644
--- a/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
+++ b/app/src/main/java/io/legado/app/data/entities/BookChapter.kt
@@ -66,7 +66,7 @@ data class BookChapter(
         val urlMatcher = AnalyzeUrl.paramPattern.matcher(url)
         val urlBefore = if(urlMatcher.find())url.substring(0,urlMatcher.start()) else url
         val urlAbsoluteBefore = NetworkUtils.getAbsoluteURL(baseUrl,urlBefore)
-        return if(urlBefore.length == url.length) urlAbsoluteBefore else urlAbsoluteBefore + url.substring(urlMatcher.end())
+        return if(urlBefore.length == url.length) urlAbsoluteBefore else urlAbsoluteBefore + ',' + url.substring(urlMatcher.end())
     }
 
     fun getFileName(): String = String.format("%05d-%s.nb", index, MD5Utils.md5Encode16(title))
diff --git a/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt b/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
index dd2d57ea4..5e66e240f 100644
--- a/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
+++ b/app/src/main/java/io/legado/app/utils/HtmlFormatter.kt
@@ -67,7 +67,7 @@ object HtmlFormatter {
                         val urlMatcher = AnalyzeUrl.paramPattern.matcher(url)
                         val find = urlMatcher.find()
                         sb.append("<img src=\"${
-                            if(find) NetworkUtils.getAbsoluteURL(redirectUrl,url.substring(0,urlMatcher.start()))+','+ url.substring(urlMatcher.end())
+                            if(find) NetworkUtils.getAbsoluteURL(redirectUrl,url.substring(0,urlMatcher.start())) + ',' + url.substring(urlMatcher.end())
                             else url
                         }\">")