diff --git a/src/fields.cpp b/src/fields.cpp
index 74991e10f..e9ed5bb80 100644
--- a/src/fields.cpp
+++ b/src/fields.cpp
@@ -214,7 +214,7 @@ fields_chunk::~fields_chunk() {
 }
 
 static void split_into_tiles(grid_volume gvol, std::vector<grid_volume> &result) {
-  size_t base_nowned_min = 1000;
+  const size_t base_nowned_min = 1000;
   if (gvol.nowned_min() < base_nowned_min) {
     result.push_back(gvol);
     return;
diff --git a/src/meep.hpp b/src/meep.hpp
index 6a05d4896..fec8e2ad5 100644
--- a/src/meep.hpp
+++ b/src/meep.hpp
@@ -1368,7 +1368,7 @@ class fields_chunk {
 
   double a, Courant, dt; // resolution a, Courant number, and timestep dt=Courant/a
   grid_volume gv;
-  std::vector<grid_volume> gvs; // subregions for cache-tiled execution of step_curl
+  std::vector<grid_volume> gvs; // subdomains for cache-tiled execution of step_curl
   volume v;
   double m;                        // angular dependence in cyl. coords
   bool zero_fields_near_cylorigin; // fields=0 m pixels near r=0 for stability
diff --git a/src/step_db.cpp b/src/step_db.cpp
index 2448cd890..c768a24a0 100644
--- a/src/step_db.cpp
+++ b/src/step_db.cpp
@@ -108,8 +108,8 @@ bool fields_chunk::step_db(field_type ft) {
               for (int iz = 0; iz <= gv_sub.nz(); ++iz) {
                 ptrdiff_t idx = ir * sr + iz;
                 f_rderiv_int[idx] =
-                    f_rderiv_int[idx - sr] +
-                    rinv * (f_p[idx] * (ir + ir0) - f_p[idx - sr] * ((ir - 1) + ir0));
+                  f_rderiv_int[idx - sr] +
+                  rinv * (f_p[idx] * (ir + ir0) - f_p[idx - sr] * ((ir - 1) + ir0));
               }
             }
             f_p = f_rderiv_int;