diff --git a/Configure.hxx.in b/Configure.hxx.in
index 4d7b3cbb63f8e5af9837e00187548ced9b0d5d55..30f8acc16bb193b23084511840c16b38769d2946 100644
--- a/Configure.hxx.in
+++ b/Configure.hxx.in
@@ -14,6 +14,9 @@
 #ifndef @KWSYS_NAMESPACE@_Configure_hxx
 #define @KWSYS_NAMESPACE@_Configure_hxx
 
+/* Include C configuration.  */
+#include <@KWSYS_NAMESPACE@/Configure.h>
+
 /* Whether kwsys namespace is "kwsys".  */
 #define @KWSYS_NAMESPACE@_NAME_IS_KWSYS @KWSYS_NAME_IS_KWSYS@