diff --git a/.eslintrc.json b/.eslintrc.json
index 27cde45..13bc598 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -10,6 +10,10 @@
         "no-undef": ["off"],
         "no-unused-vars": ["off"]
       }
+    },
+    {
+      "files": "index.js",
+      "globals": {"globalThis": false}
     }
   ]
 }
diff --git a/index.js b/index.js
index f414193..8212585 100644
--- a/index.js
+++ b/index.js
@@ -28,10 +28,14 @@
   };
 
   /* istanbul ignore else */
-  if (typeof module === 'object' && typeof module.exports === 'object') {
+  if (
+    typeof module === 'object' &&
+    module != null &&
+    typeof module.exports === 'object'
+  ) {
     module.exports = mapping;
   } else {
-    self.FantasyLand = mapping;
+    globalThis.FantasyLand = mapping;
   }
 
 } ());
diff --git a/scripts/generate-js b/scripts/generate-js
index 0bbfa71..0aa816a 100755
--- a/scripts/generate-js
+++ b/scripts/generate-js
@@ -11,10 +11,14 @@ cat >index.js <<EOF
   };
 
   /* istanbul ignore else */
-  if (typeof module === 'object' && typeof module.exports === 'object') {
+  if (
+    typeof module === 'object' &&
+    module != null &&
+    typeof module.exports === 'object'
+  ) {
     module.exports = mapping;
   } else {
-    self.FantasyLand = mapping;
+    globalThis.FantasyLand = mapping;
   }
 
 } ());