diff --git a/src/main.zig b/src/main.zig
index 788661d..abaec5c 100644
--- a/src/main.zig
+++ b/src/main.zig
@@ -87,14 +87,14 @@ pub fn main() !void {
         timer.reset();
         var bufreader = std.io.bufferedReader(file.reader());
         _ = try PDBReader(bufreader.reader(), arenaAllocator);
-        var elapsed = timer.read();
+        const elapsed = timer.read();
         try times.append(elapsed);
         var runRecord: RunRecord = RunRecord{ .run = i + 1, .time = elapsed, .file = parsedArgs.fileName };
         try runRecord.writeCSVLine(csv);
         sum += elapsed;
         std.debug.print("Run {} Complete\n", .{i});
     }
-    var average: f32 = @floatFromInt(sum / parsedArgs.runs);
-    var sumF: f32 = @floatFromInt(sum);
+    const average: f32 = @floatFromInt(sum / parsedArgs.runs);
+    const sumF: f32 = @floatFromInt(sum);
     std.debug.print("sum: {d:.6}s\nparse average: {d:.6} s\n", .{ sumF / 1e+9, average / 1e+9 });
 }
diff --git a/src/records.zig b/src/records.zig
index e4dfa19..9c2f341 100644
--- a/src/records.zig
+++ b/src/records.zig
@@ -240,7 +240,7 @@ const Line = extern struct {
         atom.z = try std.fmt.parseFloat(f32, strings.removeSpaces(&self.z));
         atom.occupancy = try std.fmt.parseFloat(f32, strings.removeSpaces(&self.occupancy));
         atom.tempFactor = try std.fmt.parseFloat(f32, strings.removeSpaces(&self.tempFactor));
-        var entry = strings.removeSpaces(&self._space4);
+        const entry = strings.removeSpaces(&self._space4);
         if (entry.len != 0) {
             atom.entry = try allocator.dupe(u8, entry);
         }
@@ -350,7 +350,7 @@ test "convert to atoms multi-line" {
         try testing.expectEqualStrings("  1.00", &parsedLine.occupancy);
         try testing.expectEqualStrings("  0.00", &parsedLine.tempFactor);
         try testing.expectEqualStrings("      PROA", &parsedLine._space4);
-        var atom = try parsedLine.convertToAtomRecord(0, line.len, testalloc);
+        const atom = try parsedLine.convertToAtomRecord(0, line.len, testalloc);
         try atoms.append(atom);
     }
     try expectEqual(2, atoms.items.len);