1 files changed, 1 insertions, 1 deletions

diff --git a/src/dispextern.h b/src/dispextern.h
index 47d5b51fb55..1201f52e946 100644
--- a/src/dispextern.h
+++ b/src/dispextern.h
@@ -3185,7 +3185,7 @@ extern unsigned row_hash (struct glyph_row *);
 
 extern int x_bitmap_height (struct frame *, ptrdiff_t);
 extern int x_bitmap_width (struct frame *, ptrdiff_t);
-extern int x_bitmap_pixmap (struct frame *, ptrdiff_t);
+extern ptrdiff_t x_bitmap_pixmap (struct frame *, ptrdiff_t);
 extern void x_reference_bitmap (struct frame *, ptrdiff_t);
 extern ptrdiff_t x_create_bitmap_from_data (struct frame *, char *,
                                             unsigned int, unsigned int);