diff --git a/src/harness/harness.ts b/src/harness/harness.ts
index 23e8106864a..b31a9f8b88a 100644
--- a/src/harness/harness.ts
+++ b/src/harness/harness.ts
@@ -945,6 +945,7 @@ namespace Harness {
 
         export function getDefaultLibFileName(options: ts.CompilerOptions): string {
             switch (options.target) {
+                case ts.ScriptTarget.ESNext:
                 case ts.ScriptTarget.ES2017:
                     return "lib.es2017.d.ts";
                 case ts.ScriptTarget.ES2016:
diff --git a/tests/cases/conformance/es2018/dynamicImport/importCallExpression1.ts b/tests/cases/conformance/es2018/dynamicImport/importCallExpression1ES2018.ts
similarity index 100%
rename from tests/cases/conformance/es2018/dynamicImport/importCallExpression1.ts
rename to tests/cases/conformance/es2018/dynamicImport/importCallExpression1ES2018.ts
diff --git a/tests/cases/conformance/es2018/dynamicImport/importCallExpression2.ts b/tests/cases/conformance/es2018/dynamicImport/importCallExpression2ES2018.ts
similarity index 100%
rename from tests/cases/conformance/es2018/dynamicImport/importCallExpression2.ts
rename to tests/cases/conformance/es2018/dynamicImport/importCallExpression2ES2018.ts