diff --git a/xbob/machine/include/xbob.machine/api.h b/xbob/machine/include/xbob.machine/api.h
index 1eab3c560318dcd6c4bb40b002f5b91ede955f99..c951ade48ca1b9ace5b37a5877682f09a47f089b 100644
--- a/xbob/machine/include/xbob.machine/api.h
+++ b/xbob/machine/include/xbob.machine/api.h
@@ -98,6 +98,8 @@ typedef struct {
    * Bindings for xbob.machine.Activation *
    ****************************************/
 
+# define PyBobMachineActivation_Type (*(PyBobMachineActivation_Type_TYPE *)PyXbobIo_API[PyBobMachineActivation_Type_NUM])
+
 # if !defined(NO_IMPORT_ARRAY)
 
   /**