diff --git a/src/testRunner/unittests/tsbuild/sample.ts b/src/testRunner/unittests/tsbuild/sample.ts
index 02e117fd7b9..5a98c0b276c 100644
--- a/src/testRunner/unittests/tsbuild/sample.ts
+++ b/src/testRunner/unittests/tsbuild/sample.ts
@@ -448,7 +448,7 @@ class someClass { }`),
                 },
                 incrementalDtsChangedBuild: {
                     modifyFs: fs => replaceText(fs, "/src/logic/tsconfig.json", `"declaration": true,`, `"declaration": true,
-        "declarationDir": "decls"`),
+        "declarationDir": "decls",`),
                     expectedDiagnostics: [
                         getExpectedDiagnosticForProjectsInBuild("src/core/tsconfig.json", "src/logic/tsconfig.json", "src/tests/tsconfig.json"),
                         [Diagnostics.Project_0_is_up_to_date_because_newest_input_1_is_older_than_oldest_output_2, "src/core/tsconfig.json", "src/core/anotherModule.ts", "src/core/anotherModule.js"],
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/buildInfo/when-logic-config-changes-declaration-dir.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/buildInfo/when-logic-config-changes-declaration-dir.js
index 6e7efc31a77..4733c81e58b 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/buildInfo/when-logic-config-changes-declaration-dir.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/buildInfo/when-logic-config-changes-declaration-dir.js
@@ -9,7 +9,7 @@ export declare const m: typeof mod;
     "compilerOptions": {
         "composite": true,
         "declaration": true,
-        "declarationDir": "decls"
+        "declarationDir": "decls",
         "sourceMap": true,
         "forceConsistentCasingInFileNames": true,
         "skipDefaultLibCheck": true
diff --git a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/no-buildInfo/when-logic-config-changes-declaration-dir.js b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/no-buildInfo/when-logic-config-changes-declaration-dir.js
index 6e7efc31a77..4733c81e58b 100644
--- a/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/no-buildInfo/when-logic-config-changes-declaration-dir.js
+++ b/tests/baselines/reference/tsbuild/sample1/incremental-declaration-changes/no-buildInfo/when-logic-config-changes-declaration-dir.js
@@ -9,7 +9,7 @@ export declare const m: typeof mod;
     "compilerOptions": {
         "composite": true,
         "declaration": true,
-        "declarationDir": "decls"
+        "declarationDir": "decls",
         "sourceMap": true,
         "forceConsistentCasingInFileNames": true,
         "skipDefaultLibCheck": true