diff --git a/src/Spring/Spring.Core/Spring.Core.build b/src/Spring/Spring.Core/Spring.Core.build
index 760ee336..aaa91517 100644
--- a/src/Spring/Spring.Core/Spring.Core.build
+++ b/src/Spring/Spring.Core/Spring.Core.build
@@ -52,6 +52,7 @@
                 <include name="System.Drawing.dll"/>
                 <include name="System.Configuration.dll"/>
                 <include name="System.Xml.dll"/>
+				<include name="System.Core.dll"/>
                 <include name="Microsoft.VisualBasic.dll"/>
             </references>
         </csc>