diff --git a/libvips/resample/affine.c b/libvips/resample/affine.c
index bb2349e2..a13a24df 100644
--- a/libvips/resample/affine.c
+++ b/libvips/resample/affine.c
@@ -381,7 +381,7 @@ vips_affine_build( VipsObject *object )
 	if( VIPS_OBJECT_CLASS( vips_affine_parent_class )->build( object ) )
 		return( -1 );
 
-	if( vips_check_coding_noneorlabq( class->nickname, in ) )
+	if( vips_check_coding_noneorlabq( class->nickname, resample->in ) )
 		return( -1 );
 	if( vips_check_vector_length( class->nickname, 
 		affine->matrix->n, 4 ) )
@@ -391,6 +391,9 @@ vips_affine_build( VipsObject *object )
 			affine->oarea->n, 4 ) )
 		return( -1 );
 
+	if( !vips_object_argument_isset( object, "interpolate" ) )
+		affine->interpolate = vips_interpolate_new( "bilinear" );
+
 	in = resample->in;
 
 	/* Set up transform.
@@ -454,7 +457,7 @@ vips_affine_build( VipsObject *object )
 
 	/* Add new pixels around the input so we can interpolate at the edges.
 	 */
-	if( vips_embed( in, &t[1], 1, 
+	if( vips_embed( in, &t[1], 
 		window_offset, window_offset, 
 		in->Xsize + window_size, in->Ysize + window_size,
 		"extend", VIPS_EXTEND_COPY,
diff --git a/libvips/resample/quadratic.c b/libvips/resample/quadratic.c
index e0936d65..8b7b7f8b 100644
--- a/libvips/resample/quadratic.c
+++ b/libvips/resample/quadratic.c
@@ -278,9 +278,7 @@ vips_quadratic_build( VipsObject *object )
 	} 
 
 	if( !vips_object_argument_isset( object, "interpolator" ) )
-		g_object_set( object, 
-			"interpolate", vips_interpolate_new( "bilinear" ),
-			NULL );
+		quadratic->interpolate = vips_interpolate_new( "bilinear" );
 	interpolate = quadratic->interpolate;
 
 	window_size = vips_interpolate_get_window_size( interpolate );