diff --git a/Server/src/main/java/org/openas2/partner/Partnership.java b/Server/src/main/java/org/openas2/partner/Partnership.java
index 3a591fb0..a91b752d 100644
--- a/Server/src/main/java/org/openas2/partner/Partnership.java
+++ b/Server/src/main/java/org/openas2/partner/Partnership.java
@@ -314,6 +314,10 @@ public void copy(Partnership partnership) {
         getSenderIDs().putAll(partnership.getSenderIDs());
         getReceiverIDs().putAll(partnership.getReceiverIDs());
         getAttributes().putAll(partnership.getAttributes());
+
+        this.useDynamicContentTypeLookup = partnership.useDynamicContentTypeLookup;
+        this.contentTypeFromFileExtensionMap = partnership.contentTypeFromFileExtensionMap;
+        this.overrideContentTypeFromFileExtensionMap = partnership.overrideContentTypeFromFileExtensionMap;
     }
 
     public boolean isAsyncMDN() {