diff --git a/odoo/addons/base/tests/test_mail.py b/odoo/addons/base/tests/test_mail.py
index 795d6824886..b94ebf57183 100644
--- a/odoo/addons/base/tests/test_mail.py
+++ b/odoo/addons/base/tests/test_mail.py
@@ -115,7 +115,7 @@ class TestSanitizer(unittest.TestCase):
         test_data = [
             (
                 '<span style="position: fixed; top: 0px; left: 50px; width: 40%; height: 50%; background-color: red;">Coin coin </span>',
-                ['background-color: red', 'Coin coin'],
+                ['background-color:red', 'Coin coin'],
                 ['position', 'top', 'left']
             ), (
                 """<div style='before: "Email Address; coincoin cheval: lapin";  
@@ -123,7 +123,7 @@ class TestSanitizer(unittest.TestCase):
     
           this; means: anything ?#ùµ"
     ; some-property: 2px; top: 3'>youplaboum</div>""",
-                ['font-size: 30px', 'youplaboum'],
+                ['font-size:30px', 'youplaboum'],
                 ['some-property', 'top', 'cheval']
             ), (
                 '<span style="width">Coincoin</span>',
diff --git a/odoo/addons/base/tests/test_mail_examples.py b/odoo/addons/base/tests/test_mail_examples.py
index a83e668d940..fcd83524fc0 100644
--- a/odoo/addons/base/tests/test_mail_examples.py
+++ b/odoo/addons/base/tests/test_mail_examples.py
@@ -510,7 +510,7 @@ REMOVE_CLASS = """
 </div>
 """
 REMOVE_CLASS_IN = [
-    '<div style="color: #000000; font-size: 12pt; font-family: \'Times New Roman\'">',
+    '<div style="color:#000000; font-size:12pt; font-family:\'Times New Roman\'">',
     'An error occured in a modal and I will send you back the html to try opening one on your end']
 REMOVE_CLASS_OUT = [
     '<div class="modal-backdrop in">',
diff --git a/odoo/tools/mail.py b/odoo/tools/mail.py
index 285808cd0cd..65ba6b32be1 100644
--- a/odoo/tools/mail.py
+++ b/odoo/tools/mail.py
@@ -154,7 +154,7 @@ class _Cleaner(clean.Cleaner):
                 if style[0].lower() in self._style_whitelist:
                     valid_styles[style[0].lower()] = style[1]
             if valid_styles:
-                el.attrib['style'] = '; '.join('%s: %s' % (key, val) for (key, val) in valid_styles.iteritems())
+                el.attrib['style'] = '; '.join('%s:%s' % (key, val) for (key, val) in valid_styles.iteritems())
             else:
                 del el.attrib['style']