diff --git a/app/src/main/java/com/huanchengfly/tieba/post/utils/ImageUtil.kt b/app/src/main/java/com/huanchengfly/tieba/post/utils/ImageUtil.kt
index 8b8c68a9..6e2b4c8e 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/utils/ImageUtil.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/utils/ImageUtil.kt
@@ -94,9 +94,7 @@ object ImageUtil {
         if (inputStream == null) return false
         val bytes = ByteArray(4)
         try {
-            inputStream.mark(0)
             inputStream.read(bytes)
-            inputStream.reset()
             val str = String(bytes)
             return str.equals("GIF8", ignoreCase = true)
         } catch (e: IOException) {