diff --git a/radicale/app/propfind.py b/radicale/app/propfind.py
index 41ba6ef9..45f5e18d 100644
--- a/radicale/app/propfind.py
+++ b/radicale/app/propfind.py
@@ -313,7 +313,7 @@ def xml_propfind_response(
                     ) and not (
                             "p" in share['Permissions'] or
                             ("p" in raw_permissions and "P" not in share['Permissions']) or
-                            (self._sharing.permit_properties_overlay and "P" not in raw_permissions and "P" not in share['Permissions'])):
+                            (not self._sharing.permit_properties_overlay and "P" not in raw_permissions and "P" not in share['Permissions'])):
                     logger.trace("PROPFIND/xml_propfind_response/current-user-privilege-set: add D:write-properties")
                     privileges.append("D:write-properties")
             elif write:
diff --git a/radicale/app/proppatch.py b/radicale/app/proppatch.py
index 462f3a0e..0f60dc97 100644
--- a/radicale/app/proppatch.py
+++ b/radicale/app/proppatch.py
@@ -124,7 +124,7 @@ class ApplicationPartProppatch(ApplicationBase):
                     ) and not (
                             "p" in share['Permissions'] or
                             ("p" in raw_permissions and "P" not in share['Permissions']) or
-                            (self._sharing.permit_properties_overlay and "P" not in raw_permissions and "P" not in share['Permissions'])):
+                            (not self._sharing.permit_properties_overlay and "P" not in raw_permissions and "P" not in share['Permissions'])):
                     logger.info("PROPPATCH request on shared %r: write-access", path_orig)
                     if permissions_filter is not None and "e" in permissions_filter:
                         logger.info("PROPPATCH request on shared %r: write-access, overlay enforced, but disabled by share permission 'e'", path_orig)