diff --git a/libavformat/avisynth.c b/libavformat/avisynth.c
index 13b5f4309c..4ebca5ecba 100644
--- a/libavformat/avisynth.c
+++ b/libavformat/avisynth.c
@@ -55,7 +55,7 @@ static int avisynth_read_header(AVFormatContext *s)
   res = AVIFileOpen(&avs->file, s->filename, OF_READ|OF_SHARE_DENY_WRITE, NULL);
   if (res != S_OK)
     {
-      av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld", res);
+      av_log(s, AV_LOG_ERROR, "AVIFileOpen failed with error %ld\n", res);
       AVIFileExit();
       return -1;
     }
@@ -63,7 +63,7 @@ static int avisynth_read_header(AVFormatContext *s)
   res = AVIFileInfo(avs->file, &info, sizeof(info));
   if (res != S_OK)
     {
-      av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld", res);
+      av_log(s, AV_LOG_ERROR, "AVIFileInfo failed with error %ld\n", res);
       AVIFileExit();
       return -1;
     }