diff --git a/pytrustnfe/xml/__init__.py b/pytrustnfe/xml/__init__.py
index 99cd580..0ed0ee5 100644
--- a/pytrustnfe/xml/__init__.py
+++ b/pytrustnfe/xml/__init__.py
@@ -61,6 +61,7 @@ def sanitize_response(response):
 def recursively_normalize(vals):
     for item in vals:
         if type(vals[item]) is str:
+            vals[item] = vals[item].strip()
             vals[item] = filters.normalize_str(vals[item])
         elif type(vals[item]) is dict:
             recursively_normalize(vals[item])