diff --git a/arch/arm/src/stm32l4/stm32l4_exti_comp.c b/arch/arm/src/stm32l4/stm32l4_exti_comp.c
index b3aeb1e592a..7c508a11668 100644
--- a/arch/arm/src/stm32l4/stm32l4_exti_comp.c
+++ b/arch/arm/src/stm32l4/stm32l4_exti_comp.c
@@ -54,7 +54,7 @@
 struct comp_callback_s
 {
   xcpt_t callback;
-  void   *arg;
+  void  *arg;
 };
 
 /****************************************************************************
diff --git a/arch/arm/src/stm32l4/stm32l4_exti_gpio.c b/arch/arm/src/stm32l4/stm32l4_exti_gpio.c
index c41fc7a8e6c..e0eeabe529f 100644
--- a/arch/arm/src/stm32l4/stm32l4_exti_gpio.c
+++ b/arch/arm/src/stm32l4/stm32l4_exti_gpio.c
@@ -62,7 +62,7 @@
 struct gpio_callback_s
 {
   xcpt_t callback;
-  void   *arg;
+  void  *arg;
 };
 
 /****************************************************************************
diff --git a/arch/arm/src/stm32l4/stm32l4_exti_pwr.c b/arch/arm/src/stm32l4/stm32l4_exti_pwr.c
index 4f8541817d1..9ac88be2dc0 100644
--- a/arch/arm/src/stm32l4/stm32l4_exti_pwr.c
+++ b/arch/arm/src/stm32l4/stm32l4_exti_pwr.c
@@ -66,7 +66,7 @@
 /* Interrupt handlers attached to the PVD EXTI */
 
 static xcpt_t g_pvd_callback;
-static void  *g_callback_arg
+static void  *g_callback_arg;
 
 /****************************************************************************
  * Public Data
diff --git a/arch/arm/src/stm32l4/stm32l4_rtcc.c b/arch/arm/src/stm32l4/stm32l4_rtcc.c
index d783804c084..0d2627123be 100644
--- a/arch/arm/src/stm32l4/stm32l4_rtcc.c
+++ b/arch/arm/src/stm32l4/stm32l4_rtcc.c
@@ -801,7 +801,7 @@ static inline void rtc_enable_alarm(void)
        * 3. Configure the RTC to generate RTC alarms (Alarm A or Alarm B).
        */
 
-      stm32l4_exti_alarm(true, false, true, stm32l4_rtc_alarm_handler);
+      stm32l4_exti_alarm(true, false, true, stm32l4_rtc_alarm_handler, NULL);
       g_alarm_enabled = true;
     }
 }