diff --git a/ChangeLog b/ChangeLog
index f290bd535..767309f7d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2017-07-05  Werner Lemberg  <wl@gnu.org>
+
+	* src/sfnt/ttcmap.c (tt_cmap_unicode_class_rec): Fix warning.
+
 2017-07-05  Werner Lemberg  <wl@gnu.org>
 
 	* src/truetype/ttgxvar.c (FT_Stream_SeekSet): Fix warning (#51395).
diff --git a/src/sfnt/ttcmap.c b/src/sfnt/ttcmap.c
index ec583d122..ef03e0442 100644
--- a/src/sfnt/ttcmap.c
+++ b/src/sfnt/ttcmap.c
@@ -3719,7 +3719,7 @@
       (FT_CMap_CharVariantListFunc) NULL,  /* charvariant_list */
       (FT_CMap_VariantCharListFunc) NULL,  /* variantchar_list */
 
-    -1,
+    ~0U,
     (TT_CMap_ValidateFunc)NULL,  /* validate      */
     (TT_CMap_Info_GetFunc)NULL   /* get_cmap_info */
   )