diff --git a/internal/util-complete/src/test/scala/DefaultParsersSpec.scala b/internal/util-complete/src/test/scala/DefaultParsersSpec.scala
new file mode 100644
index 000000000..ce3a6b2e9
--- /dev/null
+++ b/internal/util-complete/src/test/scala/DefaultParsersSpec.scala
@@ -0,0 +1,17 @@
+/*
+ * sbt
+ * Copyright 2011 - 2017, Lightbend, Inc.
+ * Copyright 2008 - 2010, Mark Harrah
+ * Licensed under BSD-3-Clause license (see LICENSE)
+ */
+
+package sbt.internal.util
+package complete
+
+import org.scalacheck._, Prop._
+
+object DefaultParsersSpec extends Properties("DefaultParsers") {
+  import DefaultParsers._
+
+  property("validID == matches(ID, s)") = forAll((s: String) => validID(s) == matches(ID, s))
+}