diff --git a/drivers/scsi/smartpqi/smartpqi.h b/drivers/scsi/smartpqi/smartpqi.h
index f340afc011b5..70eca203d72f 100644
--- a/drivers/scsi/smartpqi/smartpqi.h
+++ b/drivers/scsi/smartpqi/smartpqi.h
@@ -415,7 +415,7 @@ struct pqi_event_config {
 	u8	reserved[2];
 	u8	num_event_descriptors;
 	u8	reserved1;
-	struct pqi_event_descriptor descriptors[1];
+	struct pqi_event_descriptor descriptors[];
 };
 
 #define PQI_MAX_EVENT_DESCRIPTORS	255
diff --git a/drivers/scsi/smartpqi/smartpqi_init.c b/drivers/scsi/smartpqi/smartpqi_init.c
index fb31fb6b0979..ecb2af3f43ca 100644
--- a/drivers/scsi/smartpqi/smartpqi_init.c
+++ b/drivers/scsi/smartpqi/smartpqi_init.c
@@ -4741,8 +4741,7 @@ static int pqi_create_queues(struct pqi_ctrl_info *ctrl_info)
 }
 
 #define PQI_REPORT_EVENT_CONFIG_BUFFER_LENGTH	\
-	(offsetof(struct pqi_event_config, descriptors) + \
-	(PQI_MAX_EVENT_DESCRIPTORS * sizeof(struct pqi_event_descriptor)))
+	struct_size((struct pqi_event_config *)0, descriptors, PQI_MAX_EVENT_DESCRIPTORS)
 
 static int pqi_configure_events(struct pqi_ctrl_info *ctrl_info,
 	bool enable_events)