diff --git a/compilation/src/main/scalac/scala/tools/benchmark/BenchmarkDriver.scala b/compilation/src/main/scalac/scala/tools/benchmark/BenchmarkDriver.scala
index d585bb5..403bf77 100644
--- a/compilation/src/main/scalac/scala/tools/benchmark/BenchmarkDriver.scala
+++ b/compilation/src/main/scalac/scala/tools/benchmark/BenchmarkDriver.scala
@@ -23,14 +23,17 @@ trait BenchmarkDriver extends BaseBenchmarkDriver {
 
 
     override protected def processSettingsHook(): Boolean = {
-      if (source == "scala")
-        settings.sourcepath.value = Paths.get(s"../corpus/$source/$corpusVersion/library").toAbsolutePath.normalize.toString
-      else
-        settings.classpath.value = findScalaJars
+      if (!source.startsWith("@")) {
+        // Don't set the classpath manually if it's to be loaded by the `@` processor
+        if (source == "scala")
+          settings.sourcepath.value = Paths.get(s"../corpus/$source/$corpusVersion/library").toAbsolutePath.normalize.toString
+        else settings.classpath.value = findScalaJars
+        if (depsClasspath != null && depsClasspath.nonEmpty)
+          settings.processArgumentString(s"-cp $depsClasspath")
+      }
+
       settings.outdir.value = tempDir.getAbsolutePath
       settings.nowarn.value = true
-      if (depsClasspath != null)
-        settings.processArgumentString(s"-cp $depsClasspath")
       true
     }
   }