diff --git a/src/compiler/checker.ts b/src/compiler/checker.ts
index 80b61edd3657a..5eb14081e2a3c 100644
--- a/src/compiler/checker.ts
+++ b/src/compiler/checker.ts
@@ -1824,6 +1824,7 @@ export function createTypeChecker(host: TypeCheckerHost): TypeChecker {
         getNumberLiteralType,
         getBigIntType: () => bigintType,
         getBigIntLiteralType,
+        getUnknownType: () => unknownType,
         createPromiseType,
         createArrayType,
         getElementTypeOfArrayType,
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 4a92c3187045f..ad915af32ee83 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -5263,6 +5263,7 @@ export interface TypeChecker {
     getBigIntType(): Type;
     getBigIntLiteralType(value: PseudoBigInt): BigIntLiteralType;
     getBooleanType(): Type;
+    getUnknownType(): Type;
     /* eslint-disable @typescript-eslint/unified-signatures */
     /** @internal */
     getFalseType(fresh?: boolean): Type;
diff --git a/tests/baselines/reference/api/typescript.d.ts b/tests/baselines/reference/api/typescript.d.ts
index 4b4404634fdaa..2f7870cfad96f 100644
--- a/tests/baselines/reference/api/typescript.d.ts
+++ b/tests/baselines/reference/api/typescript.d.ts
@@ -6288,6 +6288,7 @@ declare namespace ts {
         getBigIntType(): Type;
         getBigIntLiteralType(value: PseudoBigInt): BigIntLiteralType;
         getBooleanType(): Type;
+        getUnknownType(): Type;
         getFalseType(): Type;
         getTrueType(): Type;
         getVoidType(): Type;