diff --git a/src/git.test.ts b/src/git.test.ts
index feaf9f3..c125f2d 100644
--- a/src/git.test.ts
+++ b/src/git.test.ts
@@ -4,7 +4,7 @@ import {
   getDiffFileList,
   getDiffForFile,
   getRangesForDiff,
-  getUntrackedFileList,
+  getTrackedFileList,
   hasCleanIndex,
 } from "./git";
 import {
@@ -142,33 +142,18 @@ describe("getDiffFileList", () => {
   });
 });
 
-describe("getUntrackedFileList", () => {
+describe("getTrackedFileList", () => {
   it("should get the list of untracked files", () => {
     jest.mock("child_process").resetAllMocks();
     mockedChildProcess.execFileSync.mockReturnValueOnce(
       Buffer.from(diffFileList)
     );
     expect(mockedChildProcess.execFileSync).toHaveBeenCalledTimes(0);
-    const fileListA = getUntrackedFileList(false);
-    expect(mockedChildProcess.execFileSync).toHaveBeenCalledTimes(1);
-
-    mockedChildProcess.execFileSync.mockReturnValueOnce(
-      Buffer.from(diffFileList)
-    );
-    const staged = false;
-    const fileListB = getUntrackedFileList(staged);
-    // `getUntrackedFileList` uses a cache, so the number of calls to
-    // `execFileSync` will not have increased.
+    const fileListA = getTrackedFileList();
     expect(mockedChildProcess.execFileSync).toHaveBeenCalledTimes(1);
 
     expect(fileListA).toEqual(
       ["file1", "file2", "file3"].map((p) => path.resolve(p))
     );
-    expect(fileListA).toEqual(fileListB);
-  });
-
-  it("should not get a list when looking when using staged", () => {
-    const staged = true;
-    expect(getUntrackedFileList(staged)).toEqual([]);
   });
 });
diff --git a/src/git.ts b/src/git.ts
index 747f59c..aba1295 100644
--- a/src/git.ts
+++ b/src/git.ts
@@ -51,6 +51,17 @@ const getDiffFileList = (staged: boolean): string[] => {
     .map((filePath) => resolve(filePath));
 };
 
+const getTrackedFileList = (): string[] => {
+  const args = [ "ls-files" ];
+
+  return child_process
+    .execFileSync(COMMAND, args, OPTIONS)
+    .toString()
+    .trim()
+    .split("\n")
+    .map((filePath) => resolve(filePath))
+};
+
 const hasCleanIndex = (filePath: string): boolean => {
   const args = [
     "diff",
@@ -77,29 +88,6 @@ const fetchFromOrigin = (branch: string) => {
   child_process.execFileSync(COMMAND, args, OPTIONS);
 };
 
-let untrackedFileListCache: string[] | undefined;
-const getUntrackedFileList = (
-  staged: boolean,
-  shouldRefresh = false
-): string[] => {
-  if (staged) {
-    return [];
-  }
-
-  if (untrackedFileListCache === undefined || shouldRefresh) {
-    const args = ["ls-files", "--exclude-standard", "--others"];
-
-    untrackedFileListCache = child_process
-      .execFileSync(COMMAND, args, OPTIONS)
-      .toString()
-      .trim()
-      .split("\n")
-      .map((filePath) => resolve(filePath));
-  }
-
-  return untrackedFileListCache;
-};
-
 const isHunkHeader = (input: string) => {
   const hunkHeaderRE = /^@@ [^@]* @@/u;
 
@@ -160,6 +148,6 @@ export {
   getDiffFileList,
   getDiffForFile,
   getRangesForDiff,
-  getUntrackedFileList,
+  getTrackedFileList,
   hasCleanIndex,
 };
diff --git a/src/processors.test.ts b/src/processors.test.ts
index 0d3b37d..170d70d 100644
--- a/src/processors.test.ts
+++ b/src/processors.test.ts
@@ -1,6 +1,6 @@
 jest.mock("./git", () => ({
   ...jest.requireActual<typeof git>("./git"),
-  getUntrackedFileList: jest.fn(),
+  getTrackedFileList: jest.fn(),
   getDiffFileList: jest.fn(),
   getDiffForFile: jest.fn(),
   hasCleanIndex: jest.fn(),
@@ -19,7 +19,7 @@ const untrackedFilename = "an-untracked-file.js";
 
 const gitMocked: jest.MockedObjectDeep<typeof git> = jest.mocked(git);
 gitMocked.getDiffFileList.mockReturnValue([filename]);
-gitMocked.getUntrackedFileList.mockReturnValue([untrackedFilename]);
+gitMocked.getTrackedFileList.mockReturnValue([filename, "file-with-dirty-index.js"]);
 
 describe("processors", () => {
   it("preprocess (diff and staged)", async () => {
diff --git a/src/processors.ts b/src/processors.ts
index 8b63e79..d5e2533 100644
--- a/src/processors.ts
+++ b/src/processors.ts
@@ -5,7 +5,7 @@ import {
   getDiffFileList,
   getDiffForFile,
   getRangesForDiff,
-  getUntrackedFileList,
+  getTrackedFileList,
   hasCleanIndex,
 } from "./git";
 import type { Range } from "./Range";
@@ -28,18 +28,12 @@ if (process.env.CI !== undefined) {
  * This is increasingly useful the more files there are in the repository.
  */
 const getPreProcessor =
-  (diffFileList: string[], staged: boolean) =>
+  (trackedFileSet: Set<string>, diffFileList: string[]) =>
   (text: string, filename: string) => {
-    let untrackedFileList = getUntrackedFileList(staged);
-    const shouldRefresh =
-      !diffFileList.includes(filename) && !untrackedFileList.includes(filename);
-    if (shouldRefresh) {
-      untrackedFileList = getUntrackedFileList(staged, true);
-    }
     const shouldBeProcessed =
       process.env.VSCODE_PID !== undefined ||
       diffFileList.includes(filename) ||
-      untrackedFileList.includes(filename);
+      !trackedFileSet.has(filename);
 
     return shouldBeProcessed ? [text] : [];
   };
@@ -72,7 +66,7 @@ const getUnstagedChangesError = (filename: string): [Linter.LintMessage] => {
 };
 
 const getPostProcessor =
-  (staged: boolean) =>
+  (trackedFileSet: Set<string>, staged: boolean) =>
   (
     messages: Linter.LintMessage[][],
     filename: string
@@ -81,8 +75,7 @@ const getPostProcessor =
       // No need to filter, just return
       return [];
     }
-    const untrackedFileList = getUntrackedFileList(staged);
-    if (untrackedFileList.includes(filename)) {
+    if (!trackedFileSet.has(filename)) {
       // We don't need to filter the messages of untracked files because they
       // would all be kept anyway, so we return them as-is.
       return messages.flat();
@@ -117,11 +110,12 @@ const getProcessors = (
   processorType: ProcessorType
 ): Required<Linter.Processor> => {
   const staged = processorType === "staged";
+  const trackedFileSet = new Set(getTrackedFileList());
   const diffFileList = getDiffFileList(staged);
 
   return {
-    preprocess: getPreProcessor(diffFileList, staged),
-    postprocess: getPostProcessor(staged),
+    preprocess: getPreProcessor(trackedFileSet, diffFileList),
+    postprocess: getPostProcessor(trackedFileSet, staged),
     supportsAutofix: true,
   };
 };