diff --git a/cmd/zpool/os/linux/zpool_vdev_os.c b/cmd/zpool/os/linux/zpool_vdev_os.c
index f194d28c5..862b1e619 100644
--- a/cmd/zpool/os/linux/zpool_vdev_os.c
+++ b/cmd/zpool/os/linux/zpool_vdev_os.c
@@ -87,7 +87,8 @@
 
 typedef struct vdev_disk_db_entry
 {
-	char id[24];
+	/* 24 byte name + 1 byte NULL terminator to make GCC happy */
+	char id[25];
 	int sector_size;
 } vdev_disk_db_entry_t;
 
diff --git a/module/zcommon/zfs_valstr.c b/module/zcommon/zfs_valstr.c
index e2d4d1aef..f810d206c 100644
--- a/module/zcommon/zfs_valstr.c
+++ b/module/zcommon/zfs_valstr.c
@@ -38,7 +38,9 @@
  */
 typedef struct {
 	const char	vb_bit;
-	const char	vb_pair[2];
+
+	/* 2 byte name + 1 byte NULL terminator to make GCC happy */
+	const char	vb_pair[3];
 	const char	*vb_name;
 } valstr_bit_t;
 
diff --git a/tests/zfs-tests/cmd/file/largest_file.c b/tests/zfs-tests/cmd/file/largest_file.c
index d7252556b..4cf04a768 100644
--- a/tests/zfs-tests/cmd/file/largest_file.c
+++ b/tests/zfs-tests/cmd/file/largest_file.c
@@ -61,7 +61,7 @@ main(int argc, char **argv)
 	offset_t	llseek_ret = 0;
 	int		write_ret = 0;
 	int		err = 0;
-	char		mybuf[5] = "aaaa\0";
+	char		mybuf[5] = "aaaa";
 	char		*testfile;
 	mode_t		mode = S_IRUSR | S_IWUSR | S_IRGRP | S_IROTH;
 	struct sigaction sa;