diff --git a/engines/glk/zcode/detection_tables.h b/engines/glk/zcode/detection_tables.h
index 0584235f4ba..69191c482f9 100644
--- a/engines/glk/zcode/detection_tables.h
+++ b/engines/glk/zcode/detection_tables.h
@@ -1215,6 +1215,7 @@ const FrotzGameDescription FROTZ_GAMES[] = {
 	ENTRY0("hhgttg", "R58-851002", "e867d49ad1fb9406ff4e0678a4ee2ac9", 113332),
 	ENTRY0("hhgttg", "R59-851108", "34f6abc1f2a42be127ef434fc475f0ee", 113334),
 	ENTRY0("hhgttg", "R31-871119", "379022bcd4ec74b90274c6100c33f579", 158412),
+	ENTRY0("hhgttg", "R31-871119[a]", "e762e5f6d33b2092ee68de9da12a6083", 158412),
 	ENTRY0("hollywoodhijinx", "R37-861215", "7b52824057ae24e098c228c41460ef75", 109650),
 	ENTRY0("infidel", "R22-830916", "38f713e53af720624434529ea780040c", 93556),
 	ENTRY0("journey", "R30-890322", "c9893bc0399080bd3850d4db2120d110", 280472),