diff --git a/boards/arm/stm32l4/b-l475e-iot01a/src/stm32_timer.c b/boards/arm/stm32l4/b-l475e-iot01a/src/stm32_timer.c
index 1a1de91186d..bea6bd1a328 100644
--- a/boards/arm/stm32l4/b-l475e-iot01a/src/stm32_timer.c
+++ b/boards/arm/stm32l4/b-l475e-iot01a/src/stm32_timer.c
@@ -59,6 +59,7 @@ int stm32l4_timer_driver_setup(void)
   if (ret < 0)
     {
       syslog(LOG_ERR, "ERROR: Failed to setup TIM1 at /dev/timer0: %d\n",
+            ret);
     }
 #endif
 
@@ -121,6 +122,7 @@ int stm32l4_timer_driver_setup(void)
   if (ret < 0)
     {
       syslog(LOG_ERR, "ERROR: Failed to setup TIM8 at /dev/timer7: %d\n",
+            ret);
     }
 #endif