diff --git a/sat/plugins/plugin_misc_app_manager.py b/sat/plugins/plugin_misc_app_manager.py
index 0830fb47..9b5348f1 100644
--- a/sat/plugins/plugin_misc_app_manager.py
+++ b/sat/plugins/plugin_misc_app_manager.py
@@ -160,7 +160,7 @@ class AppManager:
             )
 
         value = self.host.memory.getConfig(section, name, default)
-        if name == "public_url" and not value or not value.startswith('http'):
+        if name == "public_url" and (not value or not value.startswith('http')):
             if not value:
                 log.warning(_(
                     'No value found for "public_url", using "https://example.org" for '