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-rw-r--r--src/ftxfont.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/src/ftxfont.c b/src/ftxfont.c
index d1aa3e40403..b44905d88cd 100644
--- a/src/ftxfont.c
+++ b/src/ftxfont.c
@@ -255,6 +255,7 @@ ftxfont_open (struct frame *f, Lisp_Object entity, int pixel_size)
if (NILP (font_object))
return Qnil;
font = XFONT_OBJECT (font_object);
+ eassert (font->frame == f);
font->driver = &ftxfont_driver;
return font_object;
}