--- old/test/langtools/tools/javac/switchexpr/ParseIncomplete.java	2018-12-05 13:52:33.864556095 -0800
+++ new/test/langtools/tools/javac/switchexpr/ParseIncomplete.java	2018-12-05 13:52:33.668654088 -0800
@@ -67,7 +67,7 @@
             StringWriter out = new StringWriter();
             try {
                 JavacTask ct = (JavacTask) tool.getTask(out, null, noErrors,
-                    List.of("-XDdev", "--enable-preview", "-source", "12"), null,
+                    List.of("-XDdev", "--enable-preview", "-source", "13"), null,
                     Arrays.asList(new MyFileObject(code)));
                 ct.parse().iterator().next();
             } catch (Throwable t) {