diff --git a/arch/arm/src/stm32l4/stm32l4_pwm.c b/arch/arm/src/stm32l4/stm32l4_pwm.c
index b8a33c6b3cb..4209effeab2 100644
--- a/arch/arm/src/stm32l4/stm32l4_pwm.c
+++ b/arch/arm/src/stm32l4/stm32l4_pwm.c
@@ -3166,7 +3166,7 @@ static int pwm_timer(FAR struct pwm_lowerhalf_s *dev,
   DEBUGASSERT(priv != NULL && info != NULL);
 
 #if defined(CONFIG_STM32L4_PWM_MULTICHAN)
-  pwminfo("TIM%u frequency: %u\n",
+  pwminfo("TIM%u frequency: %" PRIu32 "\n",
           priv->timid, info->frequency);
 #else
   pwminfo("TIM%u channel: %u frequency: %" PRIu32 " duty: %08" PRIx32 "\n",