diff --git a/app/src/main/java/com/huanchengfly/tieba/post/api/models/protos/Extensions.kt b/app/src/main/java/com/huanchengfly/tieba/post/api/models/protos/Extensions.kt
index 04052ed5..27d4cfe3 100644
--- a/app/src/main/java/com/huanchengfly/tieba/post/api/models/protos/Extensions.kt
+++ b/app/src/main/java/com/huanchengfly/tieba/post/api/models/protos/Extensions.kt
@@ -161,7 +161,7 @@ private val PbContent.picUrl: String
         )
 
 val List<PbContent>.plainText: String
-    get() = renders.joinToString("\n") { toString() }
+    get() = renders.joinToString("\n") { it.toString() }
 
 @OptIn(ExperimentalTextApi::class)
 val List<PbContent>.renders: ImmutableList<PbContentRender>