diff --git a/tests/lib/cli.js b/tests/lib/cli.js
index 2b1fce7bd30..1553d8163b1 100644
--- a/tests/lib/cli.js
+++ b/tests/lib/cli.js
@@ -171,7 +171,7 @@ describe("cli", () => {
             });
         });
 
-        describe.only("when there is a local config file", () => {
+        describe("when there is a local config file", () => {
 
             it(`should load the local config file with configType:${configType}`, async () => {
                 await cli.execute("lib/cli.js", null, useFlatConfig);
@@ -487,9 +487,13 @@ describe("cli", () => {
 
                 describe("when executing without no-error-on-unmatched-pattern flag", () => {
                     it(`should throw an error on unmatched glob pattern with configType:${configType}`, async () => {
-                        const filePath = getFixturePath("unmatched-patterns");
+                        let filePath = getFixturePath("unmatched-patterns");
                         const globPattern = "unmatched*.js";
 
+                        if (useFlatConfig) {
+                            filePath = filePath.replace(/\\/gu, "/");
+                        }
+
                         await stdAssert.rejects(async () => {
                             await cli.execute(`"${filePath}/${globPattern}"`, null, useFlatConfig);
                         }, new Error(`No files matching '${filePath}/${globPattern}' were found.`));