Index: main/file.c
===================================================================
--- main/file.c	(revision 260279)
+++ main/file.c	(working copy)
@@ -1109,6 +1109,11 @@
 		if (fd > -1) {
 			errno = 0;
 			fs = get_filestream(f, bfile);
+
+			if ((fs->write_buffer = ast_malloc(32768))){
+				setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
+			}
+
 			if (!fs || rewrite_wrapper(fs, comment)) {
 				ast_log(LOG_WARNING, "Unable to rewrite %s\n", fn);
 				close(fd);
@@ -1136,9 +1141,6 @@
 			fs->vfs = NULL;
 			/* If truncated, we'll be at the beginning; if not truncated, then append */
 
-			if ((fs->write_buffer = ast_malloc(32768))){
-				setvbuf(fs->f, fs->write_buffer, _IOFBF, 32768);
-			}
 
 			f->seek(fs, 0, SEEK_END);
 		} else if (errno != EEXIST) {