diff --git a/addons/community_theme_base/models/res_config_settings.py b/addons/community_theme_base/models/res_config_settings.py
index 02f77b5..fe2a484 100644
--- a/addons/community_theme_base/models/res_config_settings.py
+++ b/addons/community_theme_base/models/res_config_settings.py
@@ -1,9 +1,10 @@
-from odoo import fields, models
+from odoo import api, fields, models
 
 DEFAULT_PRIMARY_COLOR = '#2C3E50'
 DEFAULT_SECONDARY_COLOR = '#7F8C8D'
 DEFAULT_ACCENT_COLOR = '#3498DB'
 DEFAULT_FONT = 'Inter, sans-serif'
+LOGO_PARAM = 'community_theme_base.logo'
 
 
 class ResConfigSettings(models.TransientModel):
@@ -21,8 +22,12 @@ class ResConfigSettings(models.TransientModel):
         string='Accent Colour', config_parameter='community_theme_base.accent_color',
         default=DEFAULT_ACCENT_COLOR,
     )
+    # Binary fields cannot use config_parameter= directly (Odoo's settings
+    # framework only supports boolean/integer/float/char/selection/many2one/
+    # datetime that way), so this one is persisted manually via get_values/
+    # set_values, base64-encoded into an ir.config_parameter like the others.
     theme_logo = fields.Binary(
-        string='Logo', config_parameter='community_theme_base.logo',
+        string='Logo',
         help="Shown in the website navbar and on generated PDF reports/cards. "
              "Falls back to the company logo if not set.",
     )
@@ -34,3 +39,16 @@ class ResConfigSettings(models.TransientModel):
         string='Body Font', config_parameter='community_theme_base.body_font',
         default=DEFAULT_FONT,
     )
+
+    @api.model
+    def get_values(self):
+        res = super().get_values()
+        res['theme_logo'] = self.env['ir.config_parameter'].sudo().get_param(LOGO_PARAM) or False
+        return res
+
+    def set_values(self):
+        super().set_values()
+        value = self.theme_logo
+        if isinstance(value, bytes):
+            value = value.decode()
+        self.env['ir.config_parameter'].sudo().set_param(LOGO_PARAM, value or '')