diff --git a/src/main/scala/ch/epfl/scala/GithubDependencyGraphPlugin.scala b/src/main/scala/ch/epfl/scala/GithubDependencyGraphPlugin.scala
index cb9f355..0752b55 100644
--- a/src/main/scala/ch/epfl/scala/GithubDependencyGraphPlugin.scala
+++ b/src/main/scala/ch/epfl/scala/GithubDependencyGraphPlugin.scala
@@ -128,12 +128,8 @@ object GithubDependencyGraphPlugin extends AutoPlugin {
     val resolved =
       for ((moduleReport, configRef) <- moduleReports)
         yield {
-          val module = moduleReport.module
-          val moduleRef = getReference(module)
-          val artifacts = moduleReport.artifacts.map { case (a, _) => a }
-          val classifiers = artifacts.flatMap(_.classifier).filter(_ != "default")
-          val packaging = if (classifiers.nonEmpty) "?" + classifiers.map(c => s"packaging=$c") else ""
-          val packageUrl = s"pkg:maven/${module.organization}/${module.name}@${module.revision}$packaging"
+          val moduleRef = getReference(moduleReport.module)
+          val packageUrl = formatPackageUrl(moduleReport)
           val dependencies = allDependenciesMap.getOrElse(moduleRef, Vector.empty)
           val relationship =
             if (allDirectDependenciesRefs.contains(moduleRef)) DependencyRelationship.direct
@@ -153,6 +149,14 @@ object GithubDependencyGraphPlugin extends AutoPlugin {
     githubapi.Manifest(projectModuleRef, file, metadata, resolved.toMap)
   }
 
+  private def formatPackageUrl(moduleReport: ModuleReport): String = {
+    val module = moduleReport.module
+    val artifacts = moduleReport.artifacts.map { case (a, _) => a }
+    val classifiers = artifacts.flatMap(_.classifier).filter(_ != "default")
+    val packaging = if (classifiers.nonEmpty) "?" + classifiers.map(c => s"packaging=$c").mkString("&") else ""
+    s"pkg:maven/${module.organization}/${module.name}@${module.revision}$packaging"
+  }
+
   private def isRuntime(config: ConfigRef): Boolean = runtimeConfigs.contains(config)
 
   private def githubCIEnv(name: String): String =
diff --git a/src/sbt-test/dependency-graph/coursier-manifest/build.sbt b/src/sbt-test/dependency-manifest/coursier-manifest/build.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/coursier-manifest/build.sbt
rename to src/sbt-test/dependency-manifest/coursier-manifest/build.sbt
diff --git a/src/sbt-test/dependency-graph/ci-submit/project/plugins.sbt b/src/sbt-test/dependency-manifest/coursier-manifest/project/plugins.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/ci-submit/project/plugins.sbt
rename to src/sbt-test/dependency-manifest/coursier-manifest/project/plugins.sbt
diff --git a/src/sbt-test/dependency-graph/coursier-manifest/test b/src/sbt-test/dependency-manifest/coursier-manifest/test
similarity index 100%
rename from src/sbt-test/dependency-graph/coursier-manifest/test
rename to src/sbt-test/dependency-manifest/coursier-manifest/test
diff --git a/src/sbt-test/dependency-graph/default-scala-manifest/build.sbt b/src/sbt-test/dependency-manifest/default-scala-manifest/build.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/default-scala-manifest/build.sbt
rename to src/sbt-test/dependency-manifest/default-scala-manifest/build.sbt
diff --git a/src/sbt-test/dependency-graph/coursier-manifest/project/plugins.sbt b/src/sbt-test/dependency-manifest/default-scala-manifest/project/plugins.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/coursier-manifest/project/plugins.sbt
rename to src/sbt-test/dependency-manifest/default-scala-manifest/project/plugins.sbt
diff --git a/src/sbt-test/dependency-graph/default-scala-manifest/test b/src/sbt-test/dependency-manifest/default-scala-manifest/test
similarity index 100%
rename from src/sbt-test/dependency-graph/default-scala-manifest/test
rename to src/sbt-test/dependency-manifest/default-scala-manifest/test
diff --git a/src/sbt-test/dependency-graph/ivy-manifest/build.sbt b/src/sbt-test/dependency-manifest/ivy-manifest/build.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/ivy-manifest/build.sbt
rename to src/sbt-test/dependency-manifest/ivy-manifest/build.sbt
diff --git a/src/sbt-test/dependency-graph/default-scala-manifest/project/plugins.sbt b/src/sbt-test/dependency-manifest/ivy-manifest/project/plugins.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/default-scala-manifest/project/plugins.sbt
rename to src/sbt-test/dependency-manifest/ivy-manifest/project/plugins.sbt
diff --git a/src/sbt-test/dependency-graph/ivy-manifest/test b/src/sbt-test/dependency-manifest/ivy-manifest/test
similarity index 100%
rename from src/sbt-test/dependency-graph/ivy-manifest/test
rename to src/sbt-test/dependency-manifest/ivy-manifest/test
diff --git a/src/sbt-test/dependency-manifest/package-urls/build.sbt b/src/sbt-test/dependency-manifest/package-urls/build.sbt
new file mode 100644
index 0000000..d513bdd
--- /dev/null
+++ b/src/sbt-test/dependency-manifest/package-urls/build.sbt
@@ -0,0 +1,47 @@
+import ch.epfl.scala.githubapi.DependencyRelationship
+import ch.epfl.scala.githubapi.DependencyScope
+import ch.epfl.scala.githubapi.Manifest
+import sjsonnew.shaded.scalajson.ast.unsafe.JString
+
+val checkManifest = taskKey[Unit]("Check the Github manifest of a project")
+
+inThisBuild(
+  Seq(
+    organization := "ch.epfl.scala",
+    version := "1.2.0-SNAPSHOT",
+    // use Ivy because Coursier does not allow several classifier on the same dep
+    useCoursier := false,
+    scalaVersion := "2.12.15"
+  )
+)
+
+lazy val p1 = project
+  .in(file("p1"))
+  .settings(
+    libraryDependencies ++= Seq(
+      ("com.google.inject" % "guice" % "4.0").classifier("no_aop"),
+      ("org.lwjgl" % "lwjgl" % "3.3.1")
+        .classifier("natives-windows")
+        .classifier("natives-linux")
+        .classifier("natives-macos")
+    ),
+    checkManifest := {
+      val manifest = githubDependencyManifest.value
+
+      checkDependency(manifest, "com.google.inject:guice:4.0")(
+        expectedPackageUrl = "pkg:maven/com.google.inject/guice@4.0?packaging=no_aop"
+      )
+      checkDependency(manifest, "org.lwjgl:lwjgl:3.3.1")(
+        expectedPackageUrl =
+          "pkg:maven/org.lwjgl/lwjgl@3.3.1?packaging=natives-linux&packaging=natives-macos&packaging=natives-windows"
+      )
+    }
+  )
+
+def checkDependency(manifest: Manifest, name: String)(expectedPackageUrl: String): Unit = {
+  val node = manifest.resolved(name)
+  assert(
+    node.package_url == expectedPackageUrl,
+    s"Wrong package_url for node $name:\nfound: ${node.package_url}\nexpected:$expectedPackageUrl"
+  )
+}
diff --git a/src/sbt-test/dependency-graph/ivy-manifest/project/plugins.sbt b/src/sbt-test/dependency-manifest/package-urls/project/plugins.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/ivy-manifest/project/plugins.sbt
rename to src/sbt-test/dependency-manifest/package-urls/project/plugins.sbt
diff --git a/src/sbt-test/dependency-graph/scala3-manifest/test b/src/sbt-test/dependency-manifest/package-urls/test
similarity index 100%
rename from src/sbt-test/dependency-graph/scala3-manifest/test
rename to src/sbt-test/dependency-manifest/package-urls/test
diff --git a/src/sbt-test/dependency-graph/scala3-manifest/build.sbt b/src/sbt-test/dependency-manifest/scala3-manifest/build.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/scala3-manifest/build.sbt
rename to src/sbt-test/dependency-manifest/scala3-manifest/build.sbt
diff --git a/src/sbt-test/dependency-graph/scala3-manifest/project/plugins.sbt b/src/sbt-test/dependency-manifest/scala3-manifest/project/plugins.sbt
similarity index 100%
rename from src/sbt-test/dependency-graph/scala3-manifest/project/plugins.sbt
rename to src/sbt-test/dependency-manifest/scala3-manifest/project/plugins.sbt
diff --git a/src/sbt-test/dependency-manifest/scala3-manifest/test b/src/sbt-test/dependency-manifest/scala3-manifest/test
new file mode 100644
index 0000000..929b7eb
--- /dev/null
+++ b/src/sbt-test/dependency-manifest/scala3-manifest/test
@@ -0,0 +1 @@
+> p1 / checkManifest
diff --git a/src/sbt-test/dependency-graph/ci-submit/build.sbt b/src/sbt-test/submit-snapshot/ci-submit/build.sbt
similarity index 78%
rename from src/sbt-test/dependency-graph/ci-submit/build.sbt
rename to src/sbt-test/submit-snapshot/ci-submit/build.sbt
index 84cc0d5..26f4ef1 100644
--- a/src/sbt-test/dependency-graph/ci-submit/build.sbt
+++ b/src/sbt-test/submit-snapshot/ci-submit/build.sbt
@@ -7,6 +7,8 @@ inThisBuild(
   Seq(
     organization := "ch.epfl.scala",
     version := "1.2.0-SNAPSHOT",
+    // use Ivy because Coursier does not allow several classifier on the same dep
+    useCoursier := false,
     scalaVersion := "2.13.8"
   )
 )
@@ -19,6 +21,13 @@ val a = project
       "2.12.16",
       "2.13.8",
       "3.1.3"
+    ),
+    libraryDependencies ++= Seq(
+      // a dependency with many classifiers
+      ("org.lwjgl" % "lwjgl" % "3.3.1")
+        .classifier("natives-windows")
+        .classifier("natives-linux")
+        .classifier("natives-macos")
     )
   )
 
diff --git a/src/sbt-test/submit-snapshot/ci-submit/project/plugins.sbt b/src/sbt-test/submit-snapshot/ci-submit/project/plugins.sbt
new file mode 100644
index 0000000..f4c5d73
--- /dev/null
+++ b/src/sbt-test/submit-snapshot/ci-submit/project/plugins.sbt
@@ -0,0 +1,3 @@
+val pluginVersion = sys.props("plugin.version")
+
+addSbtPlugin("ch.epfl.scala" % "sbt-github-dependency-graph" % pluginVersion)
diff --git a/src/sbt-test/dependency-graph/ci-submit/test b/src/sbt-test/submit-snapshot/ci-submit/test
similarity index 100%
rename from src/sbt-test/dependency-graph/ci-submit/test
rename to src/sbt-test/submit-snapshot/ci-submit/test