diff --git a/xpcom/idl-parser/header.py b/xpcom/idl-parser/header.py
index 91a2d3f08b9..7c15c9a709e 100644
--- a/xpcom/idl-parser/header.py
+++ b/xpcom/idl-parser/header.py
@@ -346,7 +346,7 @@ def write_interface(iface, fd):
 
         fd.write("  /* %s */\n" % m.toIDL())
         fd.write("  %s = 0;\n\n" % methodAsNative(m))
-                                                                           
+
     def write_attr_decl(a):
         printComments(fd, a.doccomments, '  ')
 
diff --git a/xpcom/idl-parser/runtests.py b/xpcom/idl-parser/runtests.py
index ef5d7dbcfe2..eb777c3d701 100644
--- a/xpcom/idl-parser/runtests.py
+++ b/xpcom/idl-parser/runtests.py
@@ -13,7 +13,7 @@ import xpidl
 class TestParser(unittest.TestCase):
     def setUp(self):
         self.p = xpidl.IDLParser()
-    
+
     def testEmpty(self):
         i = self.p.parse("", filename='f')
         self.assertTrue(isinstance(i, xpidl.IDL))