diff --git a/glib/gtester-report b/glib/gtester-report
index d11b255bc..c4790adbb 100755
--- a/glib/gtester-report
+++ b/glib/gtester-report
@@ -75,7 +75,7 @@ def attribute_as_text (node, aname, node_name = None):
 def html_indent_string (n):
   uncollapsible_space = '  ' # HTML won't compress alternating sequences of ' ' and ' '
   string = ''
-  for i in range (0, (n + 1) / 2):
+  for i in range (0, int((n + 1) / 2)):
     string += uncollapsible_space
   return string