diff --git a/funasr/runtime/onnxruntime/src/audio.cpp b/funasr/runtime/onnxruntime/src/audio.cpp
index 1eafa3f59..6bc60150f 100644
--- a/funasr/runtime/onnxruntime/src/audio.cpp
+++ b/funasr/runtime/onnxruntime/src/audio.cpp
@@ -426,7 +426,7 @@ bool Audio::FfmpegLoad(const char* buf, int n_file_len){
     return false;
 #else
     // from buf
-    char* buf_copy = (char *)malloc(n_file_len);
+    void* buf_copy = av_malloc(n_file_len);
     memcpy(buf_copy, buf, n_file_len);
 
     AVIOContext* avio_ctx = avio_alloc_context(