diff --git a/scst/include/backport.h b/scst/include/backport.h
index f9d9baa8f..5e79f7b0b 100644
--- a/scst/include/backport.h
+++ b/scst/include/backport.h
@@ -1639,6 +1639,16 @@ enum {
 };
 #endif
 
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 16, 0)
+/*
+ * See also commit cc019a5a3b58 ("scsi: scsi_transport_fc: fix typos on 64/128
+ * GBit define names") # v4.16.
+ */
+enum {
+	FC_PORTSPEED_64GBIT = 0x1000
+};
+#endif
+
 #if LINUX_VERSION_CODE < KERNEL_VERSION(5, 2, 0)
 #define wwn_to_u64(wwn) get_unaligned_be64(wwn)
 #endif