diff --git a/CHANGELOG.md b/CHANGELOG.md
index 92519821..3bdc3789 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -31,6 +31,8 @@
   
 ### Corrected Bugs
 
+* XML namespace merge bug fixed. Example: two xmlns attributes could both survive a merge whereas one should replace the other.
+
 ## 4.3.1 (2 February 2020)
 
 Patch release based on testing by Dave Cornejo, Netgate
diff --git a/lib/src/clixon_xml_map.c b/lib/src/clixon_xml_map.c
index 504cf685..72d5d9f1 100644
--- a/lib/src/clixon_xml_map.c
+++ b/lib/src/clixon_xml_map.c
@@ -1216,7 +1216,7 @@ check_namespaces(cxobj *x0, /* source */
     }
     else{ /* No, namespace does not exist in x1 _parent_ 
 	   * Check if it is exists in x1 itself */
-	if (nscache_get_prefix(x1, namespace, &pexist) == 1){
+	if (xml2prefix(x1, namespace, &pexist) == 1){
 	    /* Yes it exists, but is it equal? */
 	    if ((pexist == NULL && prefix0 == NULL) ||
 		(pexist && prefix0 &&