diff --git a/data/grampsxml.dtd b/data/grampsxml.dtd
index 36e2eee1f..86aa52242 100644
--- a/data/grampsxml.dtd
+++ b/data/grampsxml.dtd
@@ -145,7 +145,7 @@ GENDER has values of M, F, or U.
 >
 
 <!ELEMENT address ((daterange|dateval|datestr)?,street?,city?,county?,state?,
-                   country?,postal?,phone?,note?,sourceref?)>
+                   country?,postal?,phone?,note?,sourceref*)>
 <!ATTLIST address priv (0|1) #IMPLIED>
 
 <!ELEMENT street  (#PCDATA)>
diff --git a/data/grampsxml.rng b/data/grampsxml.rng
index 4bc504a51..07b8bfab4 100644
--- a/data/grampsxml.rng
+++ b/data/grampsxml.rng
@@ -240,9 +240,9 @@
     <optional><element name="note">
         <ref name="note-content"/>
     </element></optional>
-    <optional><element name="sourceref">
+    <zeroOrMore><element name="sourceref">
         <ref name="sourceref-content"/>
-    </element></optional>
+    </element></zeroOrMore>
   </define>
 
   <define name="date-content">