diff --git a/drivers/usb/device/usb_dc_stm32.c b/drivers/usb/device/usb_dc_stm32.c
index ea560ad751a4e..0d90f93dc583c 100644
--- a/drivers/usb/device/usb_dc_stm32.c
+++ b/drivers/usb/device/usb_dc_stm32.c
@@ -349,7 +349,7 @@ static int usb_dc_stm32_phy_specific_clock_enable(const struct device *const clk
 #elif DT_HAS_COMPAT_STATUS_OKAY(st_stm32n6_otghs)
 	/* Enable Vdd USB voltage monitoring */
 	LL_PWR_EnableVddUSBMonitoring();
-	while (__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY)) {
+	while (!__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY)) {
 		/* Wait for VDD33USB ready */
 	}
 	/* Enable VDDUSB */
diff --git a/drivers/usb/udc/udc_stm32.c b/drivers/usb/udc/udc_stm32.c
index 4d51730e29f26..75c03b54e1402 100644
--- a/drivers/usb/udc/udc_stm32.c
+++ b/drivers/usb/udc/udc_stm32.c
@@ -1174,10 +1174,10 @@ static int priv_clock_enable(void)
 		}
 	#endif /* DT_HAS_COMPAT_STATUS_OKAY(st_stm32_otghs) */
 #elif defined(CONFIG_SOC_SERIES_STM32N6X)
-	/* Enable Vdd USB voltage monitoring */
+	/* Enable Vdd33USB voltage monitoring */
 	LL_PWR_EnableVddUSBMonitoring();
-	while (__HAL_PWR_GET_FLAG(PWR_FLAG_USB33RDY)) {
-		/* Wait FOR VDD33USB ready */
+	while (!LL_PWR_IsActiveFlag_USB33RDY()) {
+		/* Wait for Vdd33USB ready */
 	}
 
 	/* Enable VDDUSB */