diff --git a/src/base/ftobjs.c b/src/base/ftobjs.c
index 10952a6c6..6492a1517 100644
--- a/src/base/ftobjs.c
+++ b/src/base/ftobjs.c
@@ -2532,6 +2532,7 @@
       face_index &= 0x7FFFFFFFL;
     else
     {
+      face_index  = -face_index;
       face_index &= 0x7FFFFFFFL;
       face_index  = -face_index;
     }