diff --git a/[refs] b/[refs]
index 5f30d9d33861..f24aaeaff4f5 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: e9823b21bab7ff0c39e14a7a970a40fad74ce778
+refs/heads/master: 8dc7c651dd7d95b548adef8cd56908392d3ba432
diff --git a/trunk/tools/perf/util/config.c b/trunk/tools/perf/util/config.c
index 0deac6a14b65..6faa3a18bfbd 100644
--- a/trunk/tools/perf/util/config.c
+++ b/trunk/tools/perf/util/config.c
@@ -120,7 +120,7 @@ static char *parse_value(void)
 
 static inline int iskeychar(int c)
 {
-	return isalnum(c) || c == '-';
+	return isalnum(c) || c == '-' || c == '_';
 }
 
 static int get_value(config_fn_t fn, void *data, char *name, unsigned int len)