Index: continuum-1.1/continuum-core/src/main/java/org/apache/maven/continuum/profile/DefaultProfileService.java
===================================================================
--- continuum-1.1/continuum-core/src/main/java/org/apache/maven/continuum/profile/DefaultProfileService.java	(revision 7992)
+++ continuum-1.1/continuum-core/src/main/java/org/apache/maven/continuum/profile/DefaultProfileService.java	(working copy)
@@ -165,7 +165,10 @@
         throws ProfileException
     {
         Profile stored = getProfile( profile.getId() );
-        stored.addEnvironmentVariable( envVar );
+        if( !stored.getEnvironmentVariables().contains( envVar ) )
+        {
+            stored.addEnvironmentVariable( envVar );
+        }
         try
         {
             store.updateProfile( stored );