diff --git a/lib/linter.js b/lib/linter.js
index b47e6eb1fcfb..c677810df4ef 100644
--- a/lib/linter.js
+++ b/lib/linter.js
@@ -76,19 +76,12 @@ function parseBooleanConfig(string, comment) {
         if (!name) {
             return;
         }
-        const pos = name.indexOf(":");
 
-        if (pos === -1) {
-            items[name] = {
-                value: false,
-                comment
-            };
-        } else {
-            items[name.slice(0, pos)] = {
-                value: name.slice(pos + 1) === "true",
-                comment
-            };
-        }
+        const [key, value] = name.split(":");
+        items[key] = {
+            value: value === "true",
+            comment
+        };
     });
     return items;
 }