diff --git a/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java b/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
index d9dc944..0719106 100644
--- a/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
+++ b/src/main/java/org/gcube/informationsystem/resourceregistry/schema/ResourceRegistrySchemaClientImpl.java
@@ -100,7 +100,7 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 			gxHTTPStringRequest.path(typeName);
 			
 			Map<String,String> parameters = new HashMap<>();
-			parameters.put(TypePath.POLYMORPHIC_PARAM, Boolean.FALSE.toString());
+			parameters.put(TypePath.POLYMORPHIC_QUERY_PARAMETER, Boolean.FALSE.toString());
 			gxHTTPStringRequest.queryParams(parameters);
 			
 			HttpURLConnection httpURLConnection = gxHTTPStringRequest.head();
@@ -143,7 +143,7 @@ public class ResourceRegistrySchemaClientImpl implements ResourceRegistrySchemaC
 			
 			Map<String,String> parameters = new HashMap<>();
 			if(polymorphic != null) {
-				parameters.put(TypePath.POLYMORPHIC_PARAM, polymorphic.toString());
+				parameters.put(TypePath.POLYMORPHIC_QUERY_PARAMETER, polymorphic.toString());
 			}
 			gxHTTPStringRequest.queryParams(parameters);