diff --git a/src/frontend/dvec.c b/src/frontend/dvec.c
index d356294f9..54f4efab8 100644
--- a/src/frontend/dvec.c
+++ b/src/frontend/dvec.c
@@ -40,6 +40,29 @@ dvec_alloc(char *name, int type, short flags, int length, void *storage)
 }
 
 
+void
+dvec_realloc(struct dvec *v, int length, void *storage)
+{
+    if (isreal(v)) {
+        if (storage) {
+            tfree(v->v_realdata);
+            v->v_realdata = (double *) storage;
+        } else {
+            v->v_realdata = TREALLOC(double, v->v_realdata, length);
+        }
+    } else {
+        if (storage) {
+            tfree(v->v_compdata);
+            v->v_compdata = (ngcomplex_t *) storage;
+        } else {
+            v->v_compdata = TREALLOC(ngcomplex_t, v->v_compdata, length);
+        }
+    }
+
+    v->v_length = length;
+}
+
+
 void
 dvec_trunc(struct dvec *v, int length)
 {
diff --git a/src/frontend/plotting/plotit.c b/src/frontend/plotting/plotit.c
index 781df50bc..ca9f9016e 100644
--- a/src/frontend/plotting/plotit.c
+++ b/src/frontend/plotting/plotit.c
@@ -96,13 +96,7 @@ xtend(struct dvec *v, int length)
 
     i = v->v_length;
 
-    if (isreal(v)) {
-        v->v_realdata = TREALLOC(double, v->v_realdata, length);
-        v->v_length = length;
-    } else {
-        v->v_compdata = TREALLOC(ngcomplex_t, v->v_compdata, length);
-        v->v_length = length;
-    }
+    dvec_realloc(v, length, NULL);
 
     if (isreal(v)) {
         double d = NAN;
@@ -138,15 +132,12 @@ compress(struct dvec *d, double *xcomp, double *xind)
             if (isreal(d)) {
                 double *dd = TMALLOC(double, newlen);
                 bcopy(d->v_realdata + ilo, dd, (size_t) newlen * sizeof(double));
-                tfree(d->v_realdata);
-                d->v_realdata = dd;
+                dvec_realloc(d, newlen, dd);
             } else {
                 ngcomplex_t *cc = TMALLOC(ngcomplex_t, newlen);
                 bcopy(d->v_compdata + ilo, cc, (size_t) newlen * sizeof(ngcomplex_t));
-                tfree(d->v_compdata);
-                d->v_compdata = cc;
+                dvec_realloc(d, newlen, cc);
             }
-            d->v_length = newlen;
         }
     }
 
@@ -938,9 +929,7 @@ plotit(wordlist *wl, char *hcopy, char *devname)
                     goto quit;
                 }
 
-                tfree(v->v_realdata);
-                v->v_realdata = newdata;
-                v->v_length = newlen;
+                dvec_realloc(v, newlen, newdata);
 
                 /* Why go to all this trouble if agraf ignores it? */
                 nointerp = TRUE;
diff --git a/src/frontend/vectors.c b/src/frontend/vectors.c
index 09d3b0b62..2431c86bf 100644
--- a/src/frontend/vectors.c
+++ b/src/frontend/vectors.c
@@ -576,8 +576,7 @@ vec_get(const char *vec_name)
             for (nv = vv->va_vlist; nv; nv = nv->va_next)
                 i++;
 
-            d->v_realdata = TREALLOC(double, d->v_realdata, i);
-            d->v_length = i;
+            dvec_realloc(d, i, NULL);
 
             i = 0;
             for (nv = vv->va_vlist; nv; nv = nv->va_next)
@@ -1054,8 +1053,7 @@ vec_transpose(struct dvec *v)
             }
             koffset += blocksize; /* koffset = k*blocksize = k*dim0*dim1 */
         }
-        tfree(oldreal);
-        v->v_realdata = newreal;
+        dvec_realloc(v, v->v_length, newreal);
     } else {
         newcomp = TMALLOC(ngcomplex_t, v->v_length);
         oldcomp = v->v_compdata;
@@ -1073,8 +1071,7 @@ vec_transpose(struct dvec *v)
             }
             koffset += blocksize; /* koffset = k*blocksize = k*dim0*dim1 */
         }
-        tfree(oldcomp);
-        v->v_compdata = newcomp;
+        dvec_realloc(v, v->v_length, newcomp);
     }
 }
 
diff --git a/src/include/ngspice/dvec.h b/src/include/ngspice/dvec.h
index 2c4446d9e..eb5a9a9ae 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_realloc(struct dvec *v, int length, void *storage);
 void dvec_trunc(struct dvec *v, int length);
 void dvec_free(struct dvec *);
 
diff --git a/src/ngsconvert.c b/src/ngsconvert.c
index 3065e4f10..a8e7d2647 100644
--- a/src/ngsconvert.c
+++ b/src/ngsconvert.c
@@ -174,12 +174,7 @@ oldread(char *name)
     np = i / nv;
 
     for (v = pl->pl_dvecs; v; v = v->v_next) {
-        v->v_length = (int) np;
-        if (isreal(v)) {
-            v->v_realdata = TMALLOC(double, np);
-        } else {
-            v->v_compdata = TMALLOC(ngcomplex_t, np);
-        }
+        dvec_realloc(v, (int) np, NULL);
     }
     for (i = 0; i < np; i++) {
         /* Read in the output vector for point i. If the type is