diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 4a585355cf3..f088912a228 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2016-07-22  Yao Qi  <yao.qi@linaro.org>
+
+	* ctf.c (ctf_traceframe_info): Call bt_ctf_get_uint64 rather than
+	bt_ctf_get_int64.
+
 2016-07-21  Tom Tromey  <tom@tromey.com>
 
 	* rust-lang.c (rust_tuple_struct_type_p): Return false for empty
diff --git a/gdb/ctf.c b/gdb/ctf.c
index 795c365ab3a..0e13cc1374b 100644
--- a/gdb/ctf.c
+++ b/gdb/ctf.c
@@ -1692,7 +1692,7 @@ ctf_traceframe_info (struct target_ops *self)
 	  const struct bt_definition *def;
 
 	  def = bt_ctf_get_field (event, scope, "num");
-	  vnum = (int) bt_ctf_get_int64 (def);
+	  vnum = (int) bt_ctf_get_uint64 (def);
 	  VEC_safe_push (int, info->tvars, vnum);
 	}
       else