diff --git a/src/chdman/chdmanInfo.ts b/src/chdman/chdmanInfo.ts
index 7cf468a..df21c05 100644
--- a/src/chdman/chdmanInfo.ts
+++ b/src/chdman/chdmanInfo.ts
@@ -82,8 +82,7 @@ export default {
     } else if (metadataTags.has('CHCD') || metadataTags.has('CHTR') || metadataTags.has('CHT2')) {
       type = CHDType.CD_ROM;
     } else if (metadataTags.has('CHGT') || metadataTags.has('CHGD')) {
-      // Dreamcast GD_ROM
-      type = CHDType.CD_ROM;
+      type = CHDType.GD_ROM;
     } else if (metadataTags.has('DVD')) {
       type = CHDType.DVD_ROM;
     }
diff --git a/src/chdman/common.ts b/src/chdman/common.ts
index 1da6de1..7b4824d 100644
--- a/src/chdman/common.ts
+++ b/src/chdman/common.ts
@@ -16,6 +16,7 @@ export enum CHDType {
   RAW = 1,
   HARD_DISK,
   CD_ROM,
+  GD_ROM,
   DVD_ROM,
   // LASER_DISC,
   UNKNOWN,