diff --git a/src/include/ngspice/cktdefs.h b/src/include/ngspice/cktdefs.h
index b9b14a9cc..ff4ee861f 100644
--- a/src/include/ngspice/cktdefs.h
+++ b/src/include/ngspice/cktdefs.h
@@ -7,7 +7,8 @@
 #define ngspice_CKTDEFS_H
 
 #include "ngspice/typedefs.h"
-
+/* ensure config is always included to avoid missmatching type definitions*/
+#include "ngspice/config.h"
 
 /* gtri - evt - wbk - 5/20/91 - add event-driven and enhancements data */
 #ifdef XSPICE