diff --git a/lib/awful/rules.lua b/lib/awful/rules.lua
index 614f8774..fdc18554 100644
--- a/lib/awful/rules.lua
+++ b/lib/awful/rules.lua
@@ -688,7 +688,7 @@ function rules.execute(c, props, callbacks)
 
     -- Apply the remaining properties (after known race conditions are handled).
     for property, value in pairs(props) do
-        if property ~= "focus" and type(value) == "function" then
+        if property ~= "focus" and property ~= "shape" and type(value) == "function" then
             value = value(c, props)
         end