diff --git a/build.sc b/build.sc
index 10667ab5532..1ed34737b74 100755
--- a/build.sc
+++ b/build.sc
@@ -471,6 +471,12 @@ object contrib extends MillModule {
 
   object proguard extends MillModule {
     override def compileModuleDeps = Seq(scalalib)
+    override def testArgs = T {
+      Seq(
+        "-DMILL_SCALA_LIB=" + scalalib.runClasspath().map(_.path).mkString(","),
+        "-DMILL_PROGUARD_LIB=" + runClasspath().map(_.path).mkString(",")
+      ) ++ scalalib.worker.testArgs()
+    }
   }
 
   object tut extends MillModule {
diff --git a/contrib/proguard/test/src/ProguardTests.scala b/contrib/proguard/test/src/ProguardTests.scala
index 2cac1096dcd..3b1e4b90f76 100644
--- a/contrib/proguard/test/src/ProguardTests.scala
+++ b/contrib/proguard/test/src/ProguardTests.scala
@@ -12,19 +12,27 @@ import utest.framework.TestPath
 
 object ProguardTests extends TestSuite {
 
-  object Proguard
-    extends TestUtil.BaseModule
-      with scalalib.ScalaModule
-      with Proguard {
+  object proguard extends TestUtil.BaseModule with ScalaModule with Proguard {
     // override build root to test custom builds/modules
-    override def millSourcePath: Path = TestUtil.getSrcPathStatic()
+//    override def millSourcePath: Path = TestUtil.getSrcPathStatic()
+    override def millSourcePath: os.Path =
+      TestUtil.getSrcPathBase() / millOuterCtx.enclosing.split('.')
+
     override def scalaVersion = "2.12.0"
+
+    def proguardContribClasspath = T{
+      mill.modules.Util.millProjectModule("MILL_PROGUARD_LIB", "mill-contrib-proguard", repositoriesTask())
+    }
+
+    override def runClasspath: Target[Seq[PathRef]] = T{super.runClasspath() ++ proguardContribClasspath()}
+
   }
 
-  val testModuleSourcesPath: Path = os.pwd / 'contrib / 'proguard / 'test / 'resources / "proguard"
+  val testModuleSourcesPath
+    : Path = os.pwd / 'contrib / 'proguard / 'test / 'resources / "proguard"
 
   def workspaceTest[T](m: TestUtil.BaseModule)(t: TestEvaluator => T)(
-    implicit tp: TestPath): T = {
+      implicit tp: TestPath): T = {
     val eval = new TestEvaluator(m)
     os.remove.all(m.millSourcePath)
     os.remove.all(eval.outPath)
@@ -34,14 +42,14 @@ object ProguardTests extends TestSuite {
   }
 
   def tests: Tests = Tests {
-    'proguard - {
-      "should download proguard jars" - workspaceTest(Proguard) { eval =>
-        val Right((agg, _)) = eval.apply(Proguard.proguardClasspath)
-        assert(!agg.isEmpty)
+    test("Proguard module") {
+      test("should download proguard jars") - workspaceTest(proguard) { eval =>
+        val Right((agg, _)) = eval.apply(proguard.proguardClasspath)
+        assert(!agg.iterator.toSeq.isEmpty)
       }
 
-      "create proguarded jar" - workspaceTest(Proguard) { eval =>
-        val Right((path, _)) = eval.apply(Proguard.proguard)
+      test("should create a proguarded jar") - workspaceTest(proguard) { eval =>
+        val Right((path, _)) = eval.apply(proguard.proguard)
         assert(os.exists(path.path))
       }