diff --git a/validation/custom_constraint.rst b/validation/custom_constraint.rst
index 5f0740885d5..c2b4eff130a 100644
--- a/validation/custom_constraint.rst
+++ b/validation/custom_constraint.rst
@@ -70,7 +70,7 @@ Constraint with Private Properties
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 Constraints are cached for performance reasons. To achieve this, the base
-``Constraint`` class uses PHP's :phpfunction:`get_object_vars()` function, which
+``Constraint`` class uses PHP's :phpfunction:`get_object_vars` function, which
 excludes private properties of child classes.
 
 If your constraint defines private properties, you must explicitly include them