diff --git a/source/java/org/alfresco/opencmis/AlfrescoCmisService.java b/source/java/org/alfresco/opencmis/AlfrescoCmisService.java
index 7672107991..e2d3b2b09a 100644
--- a/source/java/org/alfresco/opencmis/AlfrescoCmisService.java
+++ b/source/java/org/alfresco/opencmis/AlfrescoCmisService.java
@@ -2034,7 +2034,7 @@ public class AlfrescoCmisService extends AbstractCmisService
         CMISNodeInfo info = getOrCreateNodeInfo(objectId, "Object");
 
         // only accept a PWC
-        if (info.isVariant(CMISObjectVariant.PWC))
+        if (!info.isVariant(CMISObjectVariant.PWC))
         {
             throw new CmisVersioningException("Object is not a PWC!");
         }