diff --git a/odoo/addons/base/tests/test_mimetypes.py b/odoo/addons/base/tests/test_mimetypes.py
index 7c5738d55ab..fc393627c1a 100644
--- a/odoo/addons/base/tests/test_mimetypes.py
+++ b/odoo/addons/base/tests/test_mimetypes.py
@@ -22,6 +22,9 @@ AA/9oACAECAQE/AX//xAAUEAEAAAAAAAAAAAAAAAAAAAAA/9oACAEBAAY/An//xAAUEAEAAAAAAAAAAA
 AE/IX//2gAMAwEAAgADAAAAEB//xAAUEQEAAAAAAAAAAAAAAAAAAAAA/9oACAEDAQE/EH//xAAUEQEAAAAAAAAAAAAAAAAAAAAA
 /9oACAECAQE/EH//xAAUEAEAAAAAAAAAAAAAAAAAAAAA/9oACAEBAAE/EH//2Q=="""
 SVG = b"""PD94bWwgdmVyc2lvbj0iMS4wIiBlbmNvZGluZz0iaXNvLTg4NTktMSI/PjwhRE9DVFlQRSBzdmcgUFVCTElDICItLy9XM0MvL0RURCBTVkcgMjAwMDExMDIvL0VOIlxuICJodHRwOi8vd3d3LnczLm9yZy9UUi8yMDAwL0NSLVNWRy0yMDAwMTEwMi9EVEQvc3ZnLTIwMDAxMTAyLmR0ZCI+PHN2ZyB3aWR0aD0iMTAwJSIgaGVpZ2h0PSIxMDAlIj48ZyB0cmFuc2Zvcm09InRyYW5zbGF0ZSg1MCw1MCkiPjxyZWN0IHg9IjAiIHk9IjAiIHdpZHRoPSIxNTAiIGhlaWdodD0iNTAiIHN0eWxlPSJmaWxsOnJlZDsiIC8+PC9nPjwvc3ZnPg=="""
+NAMESPACED_SVG = b"""<svg:svg xmlns:svg="http://www.w3.org/2000/svg" viewBox="0 0 100 100">
+  <svg:rect x="10" y="10" width="80" height="80" fill="green" />
+</svg:svg>"""
 # minimal zip file with an empty `t.txt` file
 ZIP = b"""UEsDBBQACAAIAGFva1AAAAAAAAAAAAAAAAAFACAAdC50eHRVVA0AB5bgaF6W4GheluBoXnV4CwABBOgDAAAE6AMAAA
 MAUEsHCAAAAAACAAAAAAAAAFBLAQIUAxQACAAIAGFva1AAAAAAAgAAAAAAAAAFACAAAAAAAAAAAACkgQAAAAB0LnR4dFVUDQAHlu
@@ -93,6 +96,9 @@ class test_guess_mimetype(BaseCase):
         content = base64.b64decode(SVG)
         mimetype = guess_mimetype(content, default='test')
         self.assertTrue(mimetype.startswith('image/svg'))
+
+        mimetype = guess_mimetype(NAMESPACED_SVG, default='test')
+        self.assertTrue(mimetype.startswith('image/svg'))
         # Tests that whitespace padded SVG are not detected as SVG in odoo implementation
         if not magic:
             mimetype = guess_mimetype(b"   " + content, default='test')
diff --git a/odoo/tools/mimetypes.py b/odoo/tools/mimetypes.py
index fe4c503bdda..862c8c06ce7 100644
--- a/odoo/tools/mimetypes.py
+++ b/odoo/tools/mimetypes.py
@@ -107,7 +107,7 @@ def _check_olecf(data):
 
 def _check_svg(data):
     """This simply checks the existence of the opening and ending SVG tags"""
-    if b'<svg' in data and b'/svg>' in data:
+    if b'<svg' in data and b'/svg' in data:
         return 'image/svg+xml'