diff --git a/ChangeLog b/ChangeLog
index f087a885..2c00b499 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -4,6 +4,7 @@
 - fix tiff thumbnail from buffer and source [vansante]
 - in jpegsave, don't set JFIF resolution if we set EXIF resolution
 - bump minimum libheif version to 1.3 [lovell]
+- dzsave in iiif mode could set info.json dimensions off by one [Linden6]
 
 9/8/20 started 8.10.1
 - fix markdown -> xml conversion in doc generation
diff --git a/libvips/foreign/dzsave.c b/libvips/foreign/dzsave.c
index c21b573b..9b85d622 100644
--- a/libvips/foreign/dzsave.c
+++ b/libvips/foreign/dzsave.c
@@ -1049,8 +1049,8 @@ write_json( VipsForeignSaveDz *dz )
 	gsf_output_printf( out, 
 		"  \"width\": %d,\n"
 		"  \"height\": %d\n", 
-			dz->layer->image->Xsize,
-			dz->layer->image->Ysize );
+			dz->layer->width,
+			dz->layer->height );
 
 	gsf_output_printf( out, 
 		"}\n" );