diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index 2efb779283..d896fa9dd4 100644
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -9340,7 +9340,7 @@ static struct ast_custom_function checksipdomain_function = {
 };
 
 /*! \brief  function_sippeer: ${SIPPEER()} Dialplan function - reads peer data */
-int function_sippeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
+static int function_sippeer(struct ast_channel *chan, char *cmd, char *data, char *buf, size_t len)
 {
 	struct sip_peer *peer;
 	char *colname;