diff --git a/cpu/stm32l4/include/cpu_conf.h b/cpu/stm32l4/include/cpu_conf.h
index cf8f83e38..6a0e331d6 100644
--- a/cpu/stm32l4/include/cpu_conf.h
+++ b/cpu/stm32l4/include/cpu_conf.h
@@ -36,7 +36,7 @@ extern "C" {
  * @{
  */
 #define CPU_DEFAULT_IRQ_PRIO            (1U)
-#define CPU_IRQ_NUMOF                   (82U)
+#define CPU_IRQ_NUMOF                   (81U)
 /** @} */
 
 #ifdef __cplusplus