diff --git a/src/frontend/parser/complete.c b/src/frontend/parser/complete.c
index 5e89a6da7..dcf9006b5 100644
--- a/src/frontend/parser/complete.c
+++ b/src/frontend/parser/complete.c
@@ -15,6 +15,7 @@ Modified: 1999 Paolo Nenzi
 
 #include "ngspice/config.h"
 #include "ngspice/ngspice.h"
+#include "ngspice/fteext.h"
 #include "ngspice/cpdefs.h"
 #include "complete.h"