diff --git a/akka-discovery/src/main/scala/akka/discovery/Discovery.scala b/akka-discovery/src/main/scala/akka/discovery/Discovery.scala
index ab1ef0e2c5..952f9c68d8 100644
--- a/akka-discovery/src/main/scala/akka/discovery/Discovery.scala
+++ b/akka-discovery/src/main/scala/akka/discovery/Discovery.scala
@@ -115,7 +115,11 @@ object Discovery extends ExtensionId[Discovery] with ExtensionIdProvider {
       throw new RuntimeException(
         "Old version of Akka Discovery from Akka Management found on the classpath. Remove `com.lightbend.akka.discovery:akka-discovery` from the classpath..")
     } catch {
-      case _: ClassNotFoundException => // all good
+      case _: ClassCastException ⇒
+        throw new RuntimeException(
+          "Old version of Akka Discovery from Akka Management found on the classpath. Remove `com.lightbend.akka.discovery:akka-discovery` from the classpath..")
+      case _: ClassNotFoundException =>
+      // all good
     }
   }