diff --git a/storm-config.h.in b/storm-config.h.in
index effb49ade..18d8ee86e 100644
--- a/storm-config.h.in
+++ b/storm-config.h.in
@@ -46,6 +46,8 @@
 
 #cmakedefine STORM_USE_CLN_NUMBERS
 
+#cmakedefine USE_XERCES
+
 // Whether smtrat is available and to be used. 
 #cmakedefine STORM_HAVE_SMTRAT