diff --git a/odoo/http.py b/odoo/http.py
index b7d65862861..1fa110294d9 100644
--- a/odoo/http.py
+++ b/odoo/http.py
@@ -200,6 +200,9 @@ mimetypes.add_type('application/x-font-ttf', '.ttf')
 mimetypes.add_type('image/webp', '.webp')
 # Add potentially wrong (detected on windows) svg mime types
 mimetypes.add_type('image/svg+xml', '.svg')
+# this one can be present on windows with the value 'text/plain' which
+# breaks loading js files from an addon's static folder
+mimetypes.add_type('text/javascript', '.js')
 
 # To remove when corrected in Babel
 babel.core.LOCALE_ALIASES['nb'] = 'nb_NO'