diff --git a/lib/linter/linter.js b/lib/linter/linter.js
index f897b8ddb8c..ae027aa2ee3 100644
--- a/lib/linter/linter.js
+++ b/lib/linter/linter.js
@@ -326,14 +326,13 @@ function stripDirectiveComment(value) {
  * Parses comments in file to extract file-specific config of rules, globals
  * and environments and merges them with global config; also code blocks
  * where reporting is disabled or enabled and merges them with reporting config.
- * @param {string} filename The file being checked.
  * @param {ASTNode} ast The top node of the AST.
  * @param {function(string): {create: Function}} ruleMapper A map from rule IDs to defined rules
  * @param {string|null} warnInlineConfig If a string then it should warn directive comments as disabled. The string value is the config name what the setting came from.
  * @returns {{configuredRules: Object, enabledGlobals: {value:string,comment:Token}[], exportedVariables: Object, problems: Problem[], disableDirectives: DisableDirective[]}}
  * A collection of the directive comments that were found, along with any problems that occurred when parsing
  */
-function getDirectiveComments(filename, ast, ruleMapper, warnInlineConfig) {
+function getDirectiveComments(ast, ruleMapper, warnInlineConfig) {
     const configuredRules = {};
     const enabledGlobals = Object.create(null);
     const exportedVariables = {};
@@ -1332,7 +1331,7 @@ class Linter {
 
         const sourceCode = slots.lastSourceCode;
         const commentDirectives = options.allowInlineConfig
-            ? getDirectiveComments(options.filename, sourceCode.ast, ruleId => getRule(slots, ruleId), options.warnInlineConfig)
+            ? getDirectiveComments(sourceCode.ast, ruleId => getRule(slots, ruleId), options.warnInlineConfig)
             : { configuredRules: {}, enabledGlobals: {}, exportedVariables: {}, problems: [], disableDirectives: [] };
 
         // augment global scope with declared global variables
@@ -1593,7 +1592,6 @@ class Linter {
         const sourceCode = slots.lastSourceCode;
         const commentDirectives = options.allowInlineConfig
             ? getDirectiveComments(
-                options.filename,
                 sourceCode.ast,
                 ruleId => getRuleFromConfig(ruleId, config),
                 options.warnInlineConfig