diff -rupN --no-dereference freetype-2.11.0/src/base/ftobjs.c freetype-2.11.0-new/src/base/ftobjs.c
--- freetype-2.11.0/src/base/ftobjs.c	2021-07-15 12:09:04.000000000 +0200
+++ freetype-2.11.0-new/src/base/ftobjs.c	2022-04-27 18:49:57.376406531 +0200
@@ -2451,6 +2451,15 @@
 #endif
 
 
+    /* only use lower 31 bits together with sign bit */
+    if ( face_index > 0 )
+      face_index &= 0x7FFFFFFFL;
+    else
+    {
+      face_index &= 0x7FFFFFFFL;
+      face_index  = -face_index;
+    }
+
 #ifdef FT_DEBUG_LEVEL_TRACE
     FT_TRACE3(( "FT_Open_Face: " ));
     if ( face_index < 0 )