Re-add prefix to private function.
diff --git a/lib/zip_extra_field.c b/lib/zip_extra_field.c
index 4095613..85cab50 100644
--- a/lib/zip_extra_field.c
+++ b/lib/zip_extra_field.c
@@ -342,7 +342,7 @@
     }	
 
     if (zip_source_seek(za->src, (zip_int64_t)(e->orig->offset + 26), SEEK_SET) < 0) {
-	zip_error_set_from_source(&za->error, za->src);
+	_zip_error_set_from_source(&za->error, za->src);
 	return -1;
     }