diff --git a/app/common/gristUrls.ts b/app/common/gristUrls.ts
index a6eb1283..55521618 100644
--- a/app/common/gristUrls.ts
+++ b/app/common/gristUrls.ts
@@ -1038,7 +1038,7 @@ export function buildUrlId(parts: UrlIdParts): string {
     // may be in a docId (leaving just the hyphen, which is permitted).  The limits
     // could be loosened, but without much benefit.
     const codedSnapshotId = encodeURIComponent(parts.snapshotId)
-      .replace(/[_.!~*'()]/g, ch => `_${ch.charCodeAt(0).toString(16).toUpperCase()}`)
+      .replace(/[_.!~*'()-]/g, ch => `_${ch.charCodeAt(0).toString(16).toUpperCase()}`)
       .replace(/%/g, '_');
     token = `${token}~v=${codedSnapshotId}`;
   }