diff --git a/openmc/capi/plot.py b/openmc/capi/plot.py
index ac4a457b5..78fcef912 100644
--- a/openmc/capi/plot.py
+++ b/openmc/capi/plot.py
@@ -31,7 +31,7 @@ class _Position(Structure):
         elif idx == 2:
             return self.z
         else:
-            raise ValueError("{} index is invalid for _Position".format(idx))
+            raise IndexError("{} index is invalid for _Position".format(key))
 
     def __setitem__(self, idx, val):
         if idx == 0:
@@ -41,7 +41,7 @@ class _Position(Structure):
         elif idx == 2:
             self.z = val
         else:
-            raise ValueError("{} index is invalid for _Position".format(idx))
+            raise IndexError("{} index is invalid for _Position".format(idx))
 
     def __repr__(self):
         return "({}, {}, {})".format(self.x, self.y, self.z)
diff --git a/src/plot.cpp b/src/plot.cpp
index 53f6956c2..18103a141 100644
--- a/src/plot.cpp
+++ b/src/plot.cpp
@@ -954,7 +954,8 @@ RGBColor random_color() {
   return {int(prn()*255), int(prn()*255), int(prn()*255)};
 }
 
-extern "C" int openmc_id_map(const void* plot, int32_t* data_out) {
+extern "C" int openmc_id_map(const void* plot, int32_t* data_out)
+{
 
   auto plt = reinterpret_cast<const PlotBase*>(plot);
   if (!plt) {