diff --git a/litsupport/modules/codesize.py b/litsupport/modules/codesize.py
--- a/litsupport/modules/codesize.py
+++ b/litsupport/modules/codesize.py
@@ -34,9 +34,11 @@
                 if values[0] == 'Total':
                     continue
                 try:
-                    name = values[0]
+                    # Strip leading underscores and periods, which are
+                    # platform-dependent. E.g. __text -> text or .text -> text
+                    name = values[0].lstrip("__").lstrip(".")
                     val = int(values[1])
-                    metrics['size.%s' % name] = val
+                    metrics['size_%s' % name] = val
                 except ValueError:
                     logging.info("Ignoring malformed output line: %s", line)