diff --git a/ChangeLog b/ChangeLog
index 278225538d..85de0ee009 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-01  H.J. Lu  <hongjiu.lu@intel.com>
+
+	[BZ #18822]
+	* mon/gmon.c (__moncontrol): Add libc_hidden_proto and
+	libc_hidden_def.
+
 2017-10-01  H.J. Lu  <hongjiu.lu@intel.com>
 
 	[BZ #18822]
diff --git a/gmon/gmon.c b/gmon/gmon.c
index 4e48eba1bf..f1aa3b776c 100644
--- a/gmon/gmon.c
+++ b/gmon/gmon.c
@@ -62,6 +62,7 @@ static int	s_scale;
 
 void moncontrol (int mode);
 void __moncontrol (int mode);
+libc_hidden_proto (__moncontrol)
 static void write_hist (int fd);
 static void write_call_graph (int fd);
 static void write_bb_counts (int fd);
@@ -93,6 +94,7 @@ __moncontrol (int mode)
       p->state = GMON_PROF_OFF;
     }
 }
+libc_hidden_def (__moncontrol)
 weak_alias (__moncontrol, moncontrol)