diff --git a/src/frontend/dvec.c b/src/frontend/dvec.c
index 76e8e9462..d356294f9 100644
--- a/src/frontend/dvec.c
+++ b/src/frontend/dvec.c
@@ -40,6 +40,13 @@ dvec_alloc(char *name, int type, short flags, int length, void *storage)
 }
 
 
+void
+dvec_trunc(struct dvec *v, int length)
+{
+    v->v_length = length;
+}
+
+
 void
 dvec_free(struct dvec *v)
 {
diff --git a/src/frontend/plotting/plotit.c b/src/frontend/plotting/plotit.c
index d4adf4f9f..781df50bc 100644
--- a/src/frontend/plotting/plotit.c
+++ b/src/frontend/plotting/plotit.c
@@ -90,7 +90,7 @@ xtend(struct dvec *v, int length)
         return;
 
     if (v->v_length > length) {
-        v->v_length = length;
+        dvec_trunc(v, length);
         return;
     }
 
@@ -158,7 +158,7 @@ compress(struct dvec *d, double *xcomp, double *xind)
                     d->v_realdata[i] = d->v_realdata[i * cfac];
                 else
                     d->v_compdata[i] = d->v_compdata[i * cfac];
-            d->v_length = i;
+            dvec_trunc(d, i);
         }
     }
 }
diff --git a/src/frontend/rawfile.c b/src/frontend/rawfile.c
index 31ce540ff..34e6d8c9f 100644
--- a/src/frontend/rawfile.c
+++ b/src/frontend/rawfile.c
@@ -695,7 +695,7 @@ fixdims(struct dvec *v, char *s)
         ndimpoints *= v->v_dims[i];
 
     if (v->v_length >= ndimpoints)
-        v->v_length = ndimpoints;
+        dvec_trunc(v, ndimpoints);
     else
         v->v_numdims = 0;
 }
diff --git a/src/include/ngspice/dvec.h b/src/include/ngspice/dvec.h
index a5ed619b8..2c4446d9e 100644
--- a/src/include/ngspice/dvec.h
+++ b/src/include/ngspice/dvec.h
@@ -69,6 +69,7 @@ struct dveclist {
 };
 
 struct dvec *dvec_alloc(char *name, int type, short flags, int length, void *storage);
+void dvec_trunc(struct dvec *v, int length);
 void dvec_free(struct dvec *);
 
 #endif