diff --git a/core/drivers/stm32_gpio.c b/core/drivers/stm32_gpio.c
index 7c347a3e2ee..d815a43ba3a 100644
--- a/core/drivers/stm32_gpio.c
+++ b/core/drivers/stm32_gpio.c
@@ -1296,6 +1296,13 @@ static TEE_Result stm32_pinctrl_conf_apply(struct pinconf *conf)
 	for (n = 0; n < pin_count; n++) {
 		struct stm32_gpio_bank *bank = stm32_gpio_get_bank(p[n].bank);
 
+		if (!pin_is_accessible(bank, p[n].pin)) {
+			EMSG("Apply pinctrl for pin %c%u that cannot be accessed",
+			     p[n].bank + 'A', p[n].pin);
+			error = true;
+			continue;
+		}
+
 		if (p[n].cfg.nsec == !pin_is_secure(bank, p[n].pin))
 			continue;
 
@@ -1314,7 +1321,7 @@ static TEE_Result stm32_pinctrl_conf_apply(struct pinconf *conf)
 	}
 
 	if (error)
-		return TEE_ERROR_GENERIC;
+		return TEE_ERROR_SECURITY;
 
 	for (n = 0; n < pin_count; n++)
 		set_gpio_cfg(p[n].bank, p[n].pin, &p[n].cfg);