diff --git a/smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java b/smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java
index defc09868..cf4e8f9fd 100644
--- a/smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java
+++ b/smack-core/src/main/java/org/jivesoftware/smack/packet/XmlEnvironment.java
@@ -71,7 +71,7 @@ public class XmlEnvironment {
     }
 
     public String getEffectiveNamespaceOrUse(String namespace) {
-        String effectiveNamespace = getEffectiveLanguage();
+        String effectiveNamespace = getEffectiveNamespace();
         if (StringUtils.isNullOrEmpty(effectiveNamespace)) {
             return namespace;
         }