diff --git a/include/openmc/plot.h b/include/openmc/plot.h
index c5397a3e3..28c395bca 100644
--- a/include/openmc/plot.h
+++ b/include/openmc/plot.h
@@ -184,7 +184,7 @@ T PlotBase::get_map() const {
         // local variables
         bool found_cell = find_cell(p, 0);
         j = p.n_coord_ - 1;
-        if (level >= 0) {j = level + 1;}
+        if (level >= 0) { j = level; }
         if (found_cell) {
           data.set_value(y, x, p, j);
         }
diff --git a/src/plot.cpp b/src/plot.cpp
index f52c2b03f..20c3c986e 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -42,7 +42,7 @@ IdData::IdData(size_t h_res, size_t v_res)
 void
 IdData::set_value(size_t y, size_t x, const Particle& p, int level) {
   // set cell data
-  if (p.n_coord_ < level) {
+  if (p.n_coord_ <= level) {
     data_(y, x, 0) = NOT_FOUND;
   } else {
     data_(y, x, 0) = model::cells.at(p.coord_.at(level).cell)->id_;