diff --git a/openbsc/src/osmo-bsc_nat/bsc_nat.c b/openbsc/src/osmo-bsc_nat/bsc_nat.c
index 6e4282b..295535a 100644
--- a/openbsc/src/osmo-bsc_nat/bsc_nat.c
+++ b/openbsc/src/osmo-bsc_nat/bsc_nat.c
@@ -1686,17 +1686,17 @@
 }
 
 CTRL_CMD_DEFINE(fwd_cmd, "bsc *");
-int get_fwd_cmd(struct ctrl_cmd *cmd, void *data)
+static int get_fwd_cmd(struct ctrl_cmd *cmd, void *data)
 {
 	return forward_to_bsc(cmd);
 }
 
-int set_fwd_cmd(struct ctrl_cmd *cmd, void *data)
+static int set_fwd_cmd(struct ctrl_cmd *cmd, void *data)
 {
 	return forward_to_bsc(cmd);
 }
 
-int verify_fwd_cmd(struct ctrl_cmd *cmd, const char *value, void *data)
+static int verify_fwd_cmd(struct ctrl_cmd *cmd, const char *value, void *data)
 {
 	return 0;
 }