diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/client/proxy/ResourceRegistryClientImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/client/proxy/ResourceRegistryClientImpl.java
index e914e65..2170e88 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/client/proxy/ResourceRegistryClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/client/proxy/ResourceRegistryClientImpl.java
@@ -260,11 +260,13 @@ public class ResourceRegistryClientImpl implements ResourceRegistryClient {
 			String res = result.toString();
 			logger.trace("Server returned content : {}", res);
 
-			if (String.class.isAssignableFrom(clazz)) {
-				return (C) res;
+			if(Boolean.class.isAssignableFrom(clazz)){
+				return (C) ((Boolean) Boolean.getBoolean(res)) ;
+			}else if(ISManageable.class.isAssignableFrom(clazz)){
+				return (C) ISMapper.unmarshal((Class<ISManageable>) clazz, res);
 			}
-
-			return (C) ISMapper.unmarshal((Class<ISManageable>) clazz, res);
+			
+			return (C) res;
 		}
 
 	}