diff --git a/tests/baselines/reference/api/tsserverlibrary.d.ts b/tests/baselines/reference/api/tsserverlibrary.d.ts
index 4bc0f5160d2..9054531b269 100644
--- a/tests/baselines/reference/api/tsserverlibrary.d.ts
+++ b/tests/baselines/reference/api/tsserverlibrary.d.ts
@@ -2192,6 +2192,7 @@ declare namespace ts {
         indexType: Type;
         constraint?: Type;
     }
+    type TypeVariable = TypeParameter | IndexedAccessType;
     interface IndexType extends InstantiableType {
         type: InstantiableType | UnionOrIntersectionType;
     }
@@ -2216,7 +2217,7 @@ declare namespace ts {
         resolvedFalseType?: Type;
     }
     interface SubstitutionType extends InstantiableType {
-        typeParameter: TypeParameter;
+        typeVariable: TypeVariable;
         substitute: Type;
     }
     enum SignatureKind {
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 1f64dd12ab8..9a3138e8809 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -2192,6 +2192,7 @@ declare namespace ts {
         indexType: Type;
         constraint?: Type;
     }
+    type TypeVariable = TypeParameter | IndexedAccessType;
     interface IndexType extends InstantiableType {
         type: InstantiableType | UnionOrIntersectionType;
     }
@@ -2216,7 +2217,7 @@ declare namespace ts {
         resolvedFalseType?: Type;
     }
     interface SubstitutionType extends InstantiableType {
-        typeParameter: TypeParameter;
+        typeVariable: TypeVariable;
         substitute: Type;
     }
     enum SignatureKind {