diff --git a/tools/buildman/builder.py b/tools/buildman/builder.py
index fc80705..d9d86ef 100644
--- a/tools/buildman/builder.py
+++ b/tools/buildman/builder.py
@@ -1196,10 +1196,10 @@
                 Print('   ' + line, newline=True, colour=col)
 
 
-        better = []     # List of boards fixed since last commit
-        worse = []      # List of new broken boards since last commit
-        new = []        # List of boards that didn't exist last time
-        unknown = []    # List of boards that were not built
+        ok_boards = []      # List of boards fixed since last commit
+        err_boards = []     # List of new broken boards since last commit
+        new_boards = []     # List of boards that didn't exist last time
+        unknown_boards = [] # List of boards that were not built
 
         for target in board_dict:
             if target not in board_selected:
@@ -1210,13 +1210,13 @@
                 base_outcome = self._base_board_dict[target].rc
                 outcome = board_dict[target]
                 if outcome.rc == OUTCOME_UNKNOWN:
-                    unknown.append(target)
+                    unknown_boards.append(target)
                 elif outcome.rc < base_outcome:
-                    better.append(target)
+                    ok_boards.append(target)
                 elif outcome.rc > base_outcome:
-                    worse.append(target)
+                    err_boards.append(target)
             else:
-                new.append(target)
+                new_boards.append(target)
 
         # Get a list of errors that have appeared, and disappeared
         better_err, worse_err = _CalcErrorDelta(self._base_err_lines,
@@ -1225,16 +1225,16 @@
                 self._base_warn_line_boards, warn_lines, warn_line_boards, 'w')
 
         # Display results by arch
-        if (better or worse or unknown or new or worse_err or better_err
-                or worse_warn or better_warn):
+        if any((ok_boards, err_boards, unknown_boards, new_boards, worse_err,
+                better_err, worse_warn, better_warn)):
             arch_list = {}
-            self.AddOutcome(board_selected, arch_list, better, '',
+            self.AddOutcome(board_selected, arch_list, ok_boards, '',
                     self.col.GREEN)
-            self.AddOutcome(board_selected, arch_list, worse, '+',
+            self.AddOutcome(board_selected, arch_list, err_boards, '+',
                     self.col.RED)
-            self.AddOutcome(board_selected, arch_list, new, '*', self.col.BLUE)
+            self.AddOutcome(board_selected, arch_list, new_boards, '*', self.col.BLUE)
             if self._show_unknown:
-                self.AddOutcome(board_selected, arch_list, unknown, '?',
+                self.AddOutcome(board_selected, arch_list, unknown_boards, '?',
                         self.col.MAGENTA)
             for arch, target_list in arch_list.iteritems():
                 Print('%10s: %s' % (arch, target_list))