diff --git a/lib/libc+tcc.c b/lib/libc+tcc.c
index 5832f7a9..d1133d40 100644
--- a/lib/libc+tcc.c
+++ b/lib/libc+tcc.c
@@ -277,6 +277,11 @@ int
 fseek (FILE *stream, long offset, int whence)
 {
   int pos = lseek ((int)stream, offset, whence);
+  if (__mes_debug ())
+    {
+      eputs ("fread fd="); eputs (itoa ((int)stream));
+      eputs ("  =>"); eputs (itoa (pos)); eputs ("\n");
+    }
   if (pos >= 0)
     return 0;
   return -1;