diff --git a/src/callback.c b/src/callback.c
index e3b3f55e..a25538ab 100644
--- a/src/callback.c
+++ b/src/callback.c
@@ -179,8 +179,10 @@ static void backannotate_at_cursor_b_pos(xRect *r, Graph_ctx *gr)
   if(xctx->graph_values) {
     int dset, first, last, dataset = gr->dataset, i, p, ofs;
     double start, end;
-    int sweepvar_wrap = 0, sweep_idx=0; /* allow different sweep vars? */
+    int sweepvar_wrap = 0, sweep_idx;
     double xx, cursor2; /* xx is the p-th sweep variable value, cursor2 is cursor 'b' x position */
+    sweep_idx = get_raw_index(find_nth(get_tok_value(r->prop_ptr, "sweep", 0), ", ", 1));
+    if(sweep_idx < 0) sweep_idx = 0;
     cursor2 =  xctx->graph_cursor2_x;
     start = (gr->gx1 <= gr->gx2) ? gr->gx1 : gr->gx2;
     end = (gr->gx1 <= gr->gx2) ? gr->gx2 : gr->gx1;
diff --git a/xschem_library/examples/LCC_instances.sch b/xschem_library/examples/LCC_instances.sch
index 08ad99b4..6c8dd3cf 100644
--- a/xschem_library/examples/LCC_instances.sch
+++ b/xschem_library/examples/LCC_instances.sch
@@ -33,7 +33,7 @@ zz
 zzz"
 color="4 6 8"
 sweep="v(a)"
-dataset=0}
+dataset=-1}
 B 2 10 -930 570 -700 {flags=graph 
 y1 = -0.0578112
 y2 = 3.04806
@@ -45,7 +45,7 @@ node="z
 a"
 color="4 6"
 sweep="v(a) v(z)"
-dataset=0}
+dataset=-1}
 P 4 5 560 -700 560 -510 1350 -510 1350 -700 560 -700 {dash=3}
 P 4 5 820 -920 820 -730 1350 -730 1350 -920 820 -920 {dash=3}
 T {These 2 instances are equivalent} 260 -310 0 0 0.4 0.4 {}