diff --git a/src/oxframe.c b/src/oxframe.c
index 37ef91b..643a47a 100644
--- a/src/oxframe.c
+++ b/src/oxframe.c
@@ -223,13 +223,13 @@ stdio_read(void * p, size_t length, void * fp)
 static int
 stdio_seek(int64_t offset, int whence, void * fp)
 {
-  return fseek(fp, offset, whence);
+  return fseeko(fp, offset, whence);
 }
 
 static int64_t
 stdio_tell(void * fp)
 {
-  return ftell(fp);
+  return ftello(fp);
 }
 
 static void