diff --git a/libvips/arithmetic/measure.c b/libvips/arithmetic/measure.c
index 1b25f641..4d0b1fe1 100644
--- a/libvips/arithmetic/measure.c
+++ b/libvips/arithmetic/measure.c
@@ -184,7 +184,7 @@ vips_measure_build( VipsObject *object )
 						   "avg = %g, sdev = %g" ), 
 						i, j, avg, dev );
 
-				*ARY( measure->out, b, x + y * measure->h ) = 
+				*ARY( measure->out, b, i + j * measure->h ) = 
 					avg;
 			}
 		}
diff --git a/libvips/conversion/extract.c b/libvips/conversion/extract.c
index 20b35bb9..bc0634b3 100644
--- a/libvips/conversion/extract.c
+++ b/libvips/conversion/extract.c
@@ -396,6 +396,7 @@ vips_extract_band_class_init( VipsExtractBandClass *class )
 static void
 vips_extract_band_init( VipsExtractBand *extract )
 {
+	extract->n = 1;
 }
 
 int