diff --git a/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala b/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
index ce05e6c125de..32afe9c8a1e7 100644
--- a/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
+++ b/compiler/src/dotty/tools/dotc/transform/CheckUnused.scala
@@ -47,7 +47,8 @@ class CheckUnused private (phaseMode: CheckUnused.PhaseMode, suffix: String, _ke
 
   override def isRunnable(using Context): Boolean =
     ctx.settings.Wunused.value.nonEmpty &&
-    !ctx.isJava
+    !ctx.isJava &&
+    super.isRunnable
 
   // ========== SETUP ============
 
diff --git a/tests/neg-custom-args/fatal-warnings/i17335.scala b/tests/neg-custom-args/fatal-warnings/i17335.scala
new file mode 100644
index 000000000000..6629e2f151c9
--- /dev/null
+++ b/tests/neg-custom-args/fatal-warnings/i17335.scala
@@ -0,0 +1,4 @@
+// scalac: -Wunused:all
+
+def aMethod() =
+  doStuff { (x) => x } // error