diff --git a/config/kernel-bio.m4 b/config/kernel-bio.m4
index d8692bd399..aad4d31cf2 100644
--- a/config/kernel-bio.m4
+++ b/config/kernel-bio.m4
@@ -294,9 +294,8 @@ AC_DEFUN([ZFS_AC_KERNEL_SRC_BIO_SUBMIT_BIO], [
 	ZFS_LINUX_TEST_SRC([submit_bio], [
 		#include <linux/bio.h>
 	],[
-		blk_qc_t blk_qc;
 		struct bio *bio = NULL;
-		blk_qc = submit_bio(bio);
+		(void) submit_bio(bio);
 	])
 ])
 
diff --git a/module/os/linux/zfs/vdev_disk.c b/module/os/linux/zfs/vdev_disk.c
index c56fd3a6ff..fe9752a67c 100644
--- a/module/os/linux/zfs/vdev_disk.c
+++ b/module/os/linux/zfs/vdev_disk.c
@@ -433,9 +433,9 @@ static inline void
 vdev_submit_bio_impl(struct bio *bio)
 {
 #ifdef HAVE_1ARG_SUBMIT_BIO
-	submit_bio(bio);
+	(void) submit_bio(bio);
 #else
-	submit_bio(0, bio);
+	(void) submit_bio(0, bio);
 #endif
 }