diff --git a/fs/smb/common/smb2pdu.h b/fs/smb/common/smb2pdu.h
index e7ff52b8aba5..653cb3579d40 100644
--- a/fs/smb/common/smb2pdu.h
+++ b/fs/smb/common/smb2pdu.h
@@ -1452,7 +1452,7 @@ struct resume_key_ioctl_rsp {
 		__u64 ResumeKeyU64[3];
 	};
 	__le32	ContextLength;	/* MBZ */
-	char	Context[];	/* ignored, Windows sets to 4 bytes of zero */
+	char	Context[4];	/* ignored, Windows sets to 4 bytes of zero */
 } __packed;
 
 struct smb2_ioctl_rsp {