diff --git a/bindings/bindings.py b/bindings/bindings.py
index 07cb0679..8a81f541 100644
--- a/bindings/bindings.py
+++ b/bindings/bindings.py
@@ -571,6 +571,8 @@ def parse_headers(srcdir):
     if not binding.options.idwsf:
         exclusion += ( 'idwsf_strings.h', )
     for base, dirnames, filenames in os.walk(srcdir):
+        dirnames.sort()
+        filenames.sort()
         bname = os.path.basename(base)
         if bname == '.svn':
             # ignore svn directories
diff --git a/lasso/extract_types.py b/lasso/extract_types.py
index 1359cafc..64c7f3c5 100644
--- a/lasso/extract_types.py
+++ b/lasso/extract_types.py
@@ -32,7 +32,7 @@ six.print_(u"typedef GType (*type_function) ();", file=fd)
 six.print_(u"", file=fd)
 
 header_files = []
-for header_file in glob.glob('%s/*/*.h' % srcdir) + glob.glob('%s/*/*/*.h' % srcdir):
+for header_file in sorted(glob.glob('%s/*/*.h' % srcdir) + glob.glob('%s/*/*/*.h' % srcdir)):
     if ('/id-wsf/' in header_file or '/id-wsf-2.0' in header_file) and not enable_wsf:
         continue
     header_files.append(header_file)