diff --git a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithGenericCallSignaturesWithOptionalParameters.ts b/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithGenericCallSignaturesWithOptionalParameters.ts
index c893b81a233..4d7240b9ae3 100644
--- a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithGenericCallSignaturesWithOptionalParameters.ts
+++ b/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithGenericCallSignaturesWithOptionalParameters.ts
@@ -56,8 +56,8 @@ namespace GenericSignaturesInvalid {
 
 
     function foo<T>() {
-        declare var b: Base2;
-        declare var t: Target<T>;
+        var b!: Base2;
+        var t!: Target<T>;
 
         // all errors
         b.a = t.a;
diff --git a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer.ts b/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer.ts
index 750a34094ba..2a51413f35e 100644
--- a/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer.ts
+++ b/tests/cases/conformance/types/typeRelationships/assignmentCompatibility/assignmentCompatWithNumericIndexer.ts
@@ -27,16 +27,16 @@ namespace Generics {
     }
 
     function foo<T extends Base>() {
-        declare var a: A<T>;
-        declare var b: { [x: number]: Derived; }
+        var a!: A<T>;
+        var b!: { [x: number]: Derived; }
         a = b; // error
         b = a; // error
 
-        declare var b2: { [x: number]: Derived2; }
+        var b2!: { [x: number]: Derived2; }
         a = b2; // error
         b2 = a; // error
 
-        declare var b3: { [x: number]: T; }
+        var b3!: { [x: number]: T; }
         a = b3; // ok
         b3 = a; // ok
     }