diff --git a/xsd/xsd.cxx b/xsd/xsd.cxx
index 1c66a8a..dbbfed9 100644
--- a/xsd/xsd.cxx
+++ b/xsd/xsd.cxx
@@ -18,7 +18,7 @@
 
 #include <xsd-frontend/parser.hxx>
 #include <xsd-frontend/transformations/anonymous.hxx>
-#include <xsd-frontend/transformations/enum-synthesis.cxx>
+#include <xsd-frontend/transformations/enum-synthesis.hxx>
 #include <xsd-frontend/transformations/restriction.hxx>
 #include <xsd-frontend/transformations/schema-per-type.hxx>
 #include <xsd-frontend/transformations/simplifier.hxx>