diff --git a/src/plot.cpp b/src/plot.cpp
index b8c16fefe..9fd26f8a1 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -977,7 +977,7 @@ void create_voxel(Plot pl)
     pltbase.pixels_ = pl.pixels_;
     pltbase.level_ = pl.level_;
 
-    pl.origin_.z = pl.origin_.z + z * vox[2];
+    pltbase.origin_.z = ll.z + z * vox[2];
 
     auto data = pltbase.get_cell_ids();
 
diff --git a/tests/regression_tests/plot/plots.xml b/tests/regression_tests/plot/plots.xml
index 078666e75..ecfe69125 100644
--- a/tests/regression_tests/plot/plots.xml
+++ b/tests/regression_tests/plot/plots.xml
@@ -24,7 +24,7 @@
   </plot>
 
   <plot id="4" type="voxel">
-    <pixels>500 500 500</pixels>
+    <pixels>100 100 10</pixels>
     <origin>0. 0. 0.</origin>
     <width>20 20 10</width>
   </plot>