diff --git a/src/testRunner/unittests/helpers/baseline.ts b/src/testRunner/unittests/helpers/baseline.ts
index 2daac685489..2dca51f5be9 100644
--- a/src/testRunner/unittests/helpers/baseline.ts
+++ b/src/testRunner/unittests/helpers/baseline.ts
@@ -178,7 +178,7 @@ export type ReadableProgramBuildInfoFileInfo<T> = Omit<ts.BuilderState.FileInfo,
 };
 export type ReadableProgramBuildInfoRoot =
     | [original: ts.ProgramBuildInfoFileId, readable: string]
-    | [orginal: ts.ProgramBuildInfoRootStartEnd, readable: readonly string[]];
+    | [original: ts.ProgramBuildInfoRootStartEnd, readable: readonly string[]];
 export type ReadableProgramMultiFileEmitBuildInfo = Omit<ts.ProgramMultiFileEmitBuildInfo, "fileIdsList" | "fileInfos" | "root" | "referencedMap" | "exportedModulesMap" | "semanticDiagnosticsPerFile" | "affectedFilesPendingEmit" | "changeFileSet" | "emitSignatures"> & {
     fileNamesList: readonly (readonly string[])[] | undefined;
     fileInfos: ts.MapLike<ReadableProgramBuildInfoFileInfo<ts.ProgramMultiFileEmitBuildInfoFileInfo>>;