diff --git a/src/plot.cpp b/src/plot.cpp
index 489542fac..ab8db4e00 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -956,7 +956,7 @@ void create_voxel(Plot pl)
   int id;
   for (int x = 0; x < pl.pixels[0]; x++) {
     // TODO: progress bar here
-    pb.set_value(((double)x/(double)pl.pixels[0])*100);
+    pb.set_value(100.*(double)x/(double)(pl.pixels[0]-1));
     for (int y = 0; y < pl.pixels[1]; y++) {
       for (int z = 0; z < pl.pixels[2]; z++) {
         // get voxel color
diff --git a/src/progress_bar.cpp b/src/progress_bar.cpp
index 6af9c698f..444dfa5ed 100644
--- a/src/progress_bar.cpp
+++ b/src/progress_bar.cpp
@@ -27,6 +27,7 @@ bool is_terminal() {
 
 ProgressBar::ProgressBar() {
   bar = "";
+  // initialize bar
   set_value(0.0);
 }