diff --git a/_test/all.meta.json b/_test/all.meta.json
index d8a84a1..dd97684 100644
--- a/_test/all.meta.json
+++ b/_test/all.meta.json
@@ -1 +1 @@
-{"buildNum":"cdda-experimental-2024-10-11-2346","sha":"52f61be10adac5acec6ad08dd0ba4cdc9f04025a1ca02dc453321fbdaabea527"}
\ No newline at end of file
+{"buildNum":"cdda-experimental-2024-10-25-0415","sha":"5ff456238aa00ae8552bcf29190e30ff2341bad0bd5f7c4fc2b71d120762601f"}
\ No newline at end of file
diff --git a/src/types.ts b/src/types.ts
index 90fd12f..8f8689c 100644
--- a/src/types.ts
+++ b/src/types.ts
@@ -1650,7 +1650,7 @@ export type OvermapTerrain = {
   name: Translation;
 
   sym?: string; // defaults to \u00a0
-  color: string;
+  color?: string;
   // ...
 };
 
diff --git a/src/types/item/OvermapAppearance.svelte b/src/types/item/OvermapAppearance.svelte
index b0abb0f..390662b 100644
--- a/src/types/item/OvermapAppearance.svelte
+++ b/src/types/item/OvermapAppearance.svelte
@@ -84,7 +84,7 @@ function omtAppearance(
   const omt = data.byIdMaybe("overmap_terrain", omt_id);
   return omt
     ? {
-        color: omt.color,
+        color: omt.color ?? "black",
         sym: rotateSymbol(omt.sym ?? "\u00a0" /* LINE_XOXO_C */, dir),
         name: singular(omt.name),
       }
diff --git a/src/types/item/spawnLocations.ts b/src/types/item/spawnLocations.ts
index 7478868..45e296d 100644
--- a/src/types/item/spawnLocations.ts
+++ b/src/types/item/spawnLocations.ts
@@ -333,7 +333,7 @@ export function overmapAppearance(
   function omtAppearanceString(omt_id: string): string {
     const omt = data.byId("overmap_terrain", omt_id);
     return omt
-      ? `${omt.sym}\u0001${omt.color}\u0001${omt.name}`
+      ? `${omt.sym}\u0001${omt.color ?? "black"}\u0001${omt.name}`
       : `appearance_unk`;
   }
 }