diff --git a/src/include/ngspice/dvec.h b/src/include/ngspice/dvec.h
index 7c040c7f4..e24aa066f 100644
--- a/src/include/ngspice/dvec.h
+++ b/src/include/ngspice/dvec.h
@@ -3,6 +3,7 @@
 
 #include "ngspice/complex.h"
 #include "ngspice/grid.h"
+#include "ngspice/sim.h"
 
 
 /* Dvec flags. */
@@ -36,7 +37,7 @@ typedef enum {
 
 struct dvec {
     char *v_name;		/* Same as so_vname. */
-    int v_type;			/* Same as so_vtype. */
+    enum simulation_types v_type; /* Same as so_vtype. */
     short v_flags;		/* Flags (a combination of VF_*). */
     double *v_realdata;		/* Real data. */
     ngcomplex_t *v_compdata;	/* Complex data. */