diff --git a/src/bdf/bdfdrivr.c b/src/bdf/bdfdrivr.c
index f091ed0e0..01114269d 100644
--- a/src/bdf/bdfdrivr.c
+++ b/src/bdf/bdfdrivr.c
@@ -848,9 +848,9 @@ THE SOFTWARE.
 
       0,
 
-      (FT_Module_Constructor)0,
-      (FT_Module_Destructor) 0,
-      (FT_Module_Requester)  bdf_driver_requester
+      0,                        /* FT_Module_Constructor */
+      0,                        /* FT_Module_Destructor  */
+      bdf_driver_requester
     },
 
     sizeof ( BDF_FaceRec ),
diff --git a/src/pcf/pcfdrivr.c b/src/pcf/pcfdrivr.c
index adda0877b..40245635d 100644
--- a/src/pcf/pcfdrivr.c
+++ b/src/pcf/pcfdrivr.c
@@ -683,8 +683,8 @@ THE SOFTWARE.
 
       0,
 
-      0,
-      0,
+      0,                    /* FT_Module_Constructor */
+      0,                    /* FT_Module_Destructor  */
       pcf_driver_requester
     },
 
diff --git a/src/pfr/pfrdrivr.c b/src/pfr/pfrdrivr.c
index 9533e3707..c59d8ae98 100644
--- a/src/pfr/pfrdrivr.c
+++ b/src/pfr/pfrdrivr.c
@@ -4,7 +4,7 @@
 /*                                                                         */
 /*    FreeType PFR driver interface (body).                                */
 /*                                                                         */
-/*  Copyright 2002, 2003, 2004, 2006, 2008, 2010 by                        */
+/*  Copyright 2002-2004, 2006, 2008, 2010, 2011 by                         */
 /*  David Turner, Robert Wilhelm, and Werner Lemberg.                      */
 /*                                                                         */
 /*  This file is part of the FreeType project, and may only be used,       */
@@ -181,8 +181,8 @@
 
       NULL,
 
-      0,
-      0,
+      0,                /* FT_Module_Constructor */
+      0,                /* FT_Module_Destructor  */
       pfr_get_service
     },