--- a/src/bdf/bdflib.c
+++ b/src/bdf/bdflib.c
@@ -462,7 +462,7 @@
     if ( num_items > list->size )
     {
       unsigned long  oldsize = list->size; /* same as _bdf_list_t.size */
-      unsigned long  newsize = oldsize + ( oldsize >> 1 ) + 4;
+      unsigned long  newsize = oldsize + ( oldsize >> 1 ) + 5;
       unsigned long  bigsize = (unsigned long)( FT_INT_MAX / sizeof ( char* ) );
       FT_Memory      memory  = list->memory;