diff --git a/GammaWorld7e/sheet.json b/GammaWorld7e/sheet.json
index 7427d47976..d93db7ff28 100644
--- a/GammaWorld7e/sheet.json
+++ b/GammaWorld7e/sheet.json
@@ -4,5 +4,6 @@
     "authors": "Ada Lindberg",
     "preview": "gammaWorld7_preview.png",
     "roll20userid": "46544",
-    "instructions": "For use with Gamma World 7th edition (the one based upon D&D 4e)."
+    "instructions": "For use with Gamma World 7th edition (the one based upon D&D 4e).",
+    "legacy": true
 }