1 files changed, 2 insertions, 2 deletions
diff --git a/demo/app/src/main/java/org/pf4j/demo/Boot.java b/demo/app/src/main/java/org/pf4j/demo/Boot.java
index 562f8f8..066a207 100644
--- a/demo/app/src/main/java/org/pf4j/demo/Boot.java
+++ b/demo/app/src/main/java/org/pf4j/demo/Boot.java
@@ -73,8 +73,8 @@ public class Boot {
         }
 
         System.out.println("Extension classes by classpath:");
-        List<Class<Greeting>> greetingsClasses = pluginManager.getExtensionClasses(Greeting.class);
-        for (Class<Greeting> greeting : greetingsClasses) {
+        List<Class<? extends Greeting>> greetingsClasses = pluginManager.getExtensionClasses(Greeting.class);
+        for (Class<? extends Greeting> greeting : greetingsClasses) {
             System.out.println("   Class: " + greeting.getCanonicalName());
         }