diff --git a/tools/perf/util/annotate.c b/tools/perf/util/annotate.c
index ef1866a902c442158fa348bcd3f7cb1b1fb381b4..bee0fee122f85427671cd3a325520ff3b82d7fc6 100644
--- a/tools/perf/util/annotate.c
+++ b/tools/perf/util/annotate.c
@@ -1892,7 +1892,7 @@ static char *expand_tabs(char *line, char **storage, size_t *storage_len)
 	}
 
 	/* Expand the last region. */
-	len = line_len + 1 - src;
+	len = line_len - src;
 	memcpy(&new_line[dst], &line[src], len);
 	dst += len;
 	new_line[dst] = '\0';