diff --git a/src/hb-font-private.h b/src/hb-font-private.h
index b147bceac..46686b771 100644
--- a/src/hb-font-private.h
+++ b/src/hb-font-private.h
@@ -63,8 +63,8 @@ struct _hb_face_t {
   hb_reference_count_t ref_count;
 
   hb_get_table_func_t  get_table;
-  hb_destroy_func_t    destroy;
   void                *user_data;
+  hb_destroy_func_t    destroy;
 
   hb_blob_t *head_blob;
   const struct head *head_table;
@@ -87,8 +87,8 @@ struct _hb_font_t {
   unsigned int y_ppem;
 
   hb_font_funcs_t   *klass;
-  hb_destroy_func_t  destroy;
   void              *user_data;
+  hb_destroy_func_t  destroy;
 };
 
 
diff --git a/src/hb-font.cc b/src/hb-font.cc
index 63631a98f..43112c11f 100644
--- a/src/hb-font.cc
+++ b/src/hb-font.cc
@@ -296,8 +296,8 @@ static hb_face_t _hb_face_nil = {
   HB_REFERENCE_COUNT_INVALID, /* ref_count */
 
   NULL, /* get_table */
-  NULL, /* destroy */
   NULL, /* user_data */
+  NULL, /* destroy */
 
   NULL, /* head_blob */
   NULL, /* head_table */
@@ -308,8 +308,8 @@ static hb_face_t _hb_face_nil = {
 
 hb_face_t *
 hb_face_create_for_tables (hb_get_table_func_t  get_table,
-			   hb_destroy_func_t    destroy,
-			   void                *user_data)
+			   void                *user_data,
+			   hb_destroy_func_t    destroy)
 {
   hb_face_t *face;
 
@@ -320,8 +320,8 @@ hb_face_create_for_tables (hb_get_table_func_t  get_table,
   }
 
   face->get_table = get_table;
-  face->destroy = destroy;
   face->user_data = user_data;
+  face->destroy = destroy;
 
   face->ot_layout = _hb_ot_layout_new (face);
 
@@ -386,8 +386,8 @@ hb_face_create_for_data (hb_blob_t    *blob,
     return &_hb_face_nil;
 
   return hb_face_create_for_tables (_hb_face_for_data_get_table,
-				    (hb_destroy_func_t) _hb_face_for_data_closure_destroy,
-				    closure);
+				    closure,
+				    (hb_destroy_func_t) _hb_face_for_data_closure_destroy);
 }
 
 
@@ -454,8 +454,8 @@ static hb_font_t _hb_font_nil = {
   0, /* y_ppem */
 
   NULL, /* klass */
-  NULL, /* destroy */
-  NULL  /* user_data */
+  NULL, /* user_data */
+  NULL  /* destroy */
 };
 
 hb_font_t *
@@ -498,8 +498,8 @@ hb_font_destroy (hb_font_t *font)
 void
 hb_font_set_funcs (hb_font_t         *font,
 		   hb_font_funcs_t   *klass,
-		   hb_destroy_func_t  destroy,
-		   void              *user_data)
+		   void              *user_data,
+		   hb_destroy_func_t  destroy)
 {
   if (HB_OBJECT_IS_INERT (font))
     return;
@@ -513,28 +513,28 @@ hb_font_set_funcs (hb_font_t         *font,
   hb_font_funcs_reference (klass);
   hb_font_funcs_destroy (font->klass);
   font->klass = klass;
-  font->destroy = destroy;
   font->user_data = user_data;
+  font->destroy = destroy;
 }
 
 void
 hb_font_unset_funcs (hb_font_t          *font,
 		     hb_font_funcs_t   **klass,
-		     hb_destroy_func_t  *destroy,
-		     void              **user_data)
+		     void              **user_data,
+		     hb_destroy_func_t  *destroy)
 {
   /* None of the input arguments can be NULL. */
 
   *klass = font->klass;
-  *destroy = font->destroy;
   *user_data = font->user_data;
+  *destroy = font->destroy;
 
   if (HB_OBJECT_IS_INERT (font))
     return;
 
   font->klass = NULL;
-  font->destroy = NULL;
   font->user_data = NULL;
+  font->destroy = NULL;
 }
 
 void
diff --git a/src/hb-font.h b/src/hb-font.h
index f33e56feb..4b9540b0c 100644
--- a/src/hb-font.h
+++ b/src/hb-font.h
@@ -49,8 +49,8 @@ typedef hb_blob_t * (*hb_get_table_func_t)  (hb_tag_t tag, void *user_data);
 /* calls destroy() when not needing user_data anymore */
 hb_face_t *
 hb_face_create_for_tables (hb_get_table_func_t  get_table,
-			   hb_destroy_func_t    destroy,
-			   void                *user_data);
+			   void                *user_data,
+			   hb_destroy_func_t    destroy);
 
 hb_face_t *
 hb_face_reference (hb_face_t *face);
@@ -218,8 +218,8 @@ hb_font_destroy (hb_font_t *font);
 void
 hb_font_set_funcs (hb_font_t         *font,
 		   hb_font_funcs_t   *klass,
-		   hb_destroy_func_t  destroy,
-		   void              *user_data);
+		   void              *user_data,
+		   hb_destroy_func_t  destroy);
 
 /* Returns what was set and unsets it, but doesn't destroy(user_data).
  * This is useful for wrapping / chaining font_funcs_t's.
@@ -234,8 +234,8 @@ hb_font_set_funcs (hb_font_t         *font,
 void
 hb_font_unset_funcs (hb_font_t          *font,
 		     hb_font_funcs_t   **klass,
-		     hb_destroy_func_t  *destroy,
-		     void              **user_data);
+		     void              **user_data,
+		     hb_destroy_func_t  *destroy);
 
 
 /*
diff --git a/src/hb-ft.c b/src/hb-ft.c
index e696fe824..96c035abc 100644
--- a/src/hb-ft.c
+++ b/src/hb-ft.c
@@ -189,7 +189,7 @@ get_table  (hb_tag_t tag, void *user_data)
 
   return hb_blob_create ((const char *) buffer, length,
 			 HB_MEMORY_MODE_WRITABLE,
-			 free, buffer);
+			 buffer, free);
 }
 
 
@@ -206,11 +206,11 @@ hb_ft_face_create (FT_Face           ft_face,
 			   (unsigned int) ft_face->stream->size,
 			   /* TODO: Check FT_FACE_FLAG_EXTERNAL_STREAM? */
 			   HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
-			   destroy, ft_face);
+			   ft_face, destroy);
     face = hb_face_create_for_data (blob, ft_face->face_index);
     hb_blob_destroy (blob);
   } else {
-    face = hb_face_create_for_tables (get_table, destroy, ft_face);
+    face = hb_face_create_for_tables (get_table, ft_face, destroy);
   }
 
   return face;
@@ -247,7 +247,7 @@ hb_ft_font_create (FT_Face           ft_face,
   font = hb_font_create ();
   hb_font_set_funcs (font,
 		     hb_ft_get_font_funcs (),
-		     destroy, ft_face);
+		     ft_face, destroy);
   hb_font_set_scale (font,
 		     ((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
 		     ((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);