diff --git a/.eslintrc.hound.json b/.eslintrc.hound.json
index 027542f4..9f651a1b 100644
--- a/.eslintrc.hound.json
+++ b/.eslintrc.hound.json
@@ -278,8 +278,9 @@
         ]
     },
     "globals": {
-        "OpenSeadragon": true,
-        "define": false,
-        "module": false
+        "OpenSeadragon": "writable",
+        "define": "readonly",
+        "module": "readonly",
+        "Map": "readonly"
     }
 }
diff --git a/.eslintrc.json b/.eslintrc.json
index e3495e52..75715c85 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -17,9 +17,10 @@
         }
     },
     "globals": {
-        "OpenSeadragon": true,
-        "define": false,
-        "module": false
+        "OpenSeadragon": "writable",
+        "define": "readonly",
+        "module": "readonly",
+        "Map": "readonly"
     },
     "rules": {
         "no-unused-vars": [