diff --git a/PySide/QtCore/typesystem_core.xml b/PySide/QtCore/typesystem_core.xml
index e90f77d..6b93a0c 100644
--- a/PySide/QtCore/typesystem_core.xml
+++ b/PySide/QtCore/typesystem_core.xml
@@ -2850,7 +2850,7 @@
 
     <modify-function signature="addAnimation(QAbstractAnimation*)">
       <modify-argument index="1">
-        <reference-count action="set"/>
+        <reference-count action="add"/>
       </modify-argument>
     </modify-function>