diff --git a/src/jtag/adapter.c b/src/jtag/adapter.c
index 76a2aaba6..a0432b692 100644
--- a/src/jtag/adapter.c
+++ b/src/jtag/adapter.c
@@ -844,7 +844,7 @@ static int get_gpio_index(const char *signal_name)
 	return -1;
 }
 
-COMMAND_HELPER(helper_adapter_gpio_print_config, enum adapter_gpio_config_index gpio_idx)
+static COMMAND_HELPER(helper_adapter_gpio_print_config, enum adapter_gpio_config_index gpio_idx)
 {
 	struct adapter_gpio_config *gpio_config = &adapter_config.gpios[gpio_idx];
 	const char *active_state = gpio_config->active_low ? "low" : "high";
diff --git a/src/jtag/drivers/linuxgpiod.c b/src/jtag/drivers/linuxgpiod.c
index e8e93a55b..35494cb7a 100644
--- a/src/jtag/drivers/linuxgpiod.c
+++ b/src/jtag/drivers/linuxgpiod.c
@@ -275,7 +275,7 @@ static int linuxgpiod_quit(void)
 	return ERROR_OK;
 }
 
-int helper_get_line(enum adapter_gpio_config_index idx)
+static int helper_get_line(enum adapter_gpio_config_index idx)
 {
 	if (!is_gpio_config_valid(idx))
 		return ERROR_OK;