diff --git a/libvips/foreign/heifsave.c b/libvips/foreign/heifsave.c
index 3256a8a3..cf9af771 100644
--- a/libvips/foreign/heifsave.c
+++ b/libvips/foreign/heifsave.c
@@ -390,8 +390,8 @@ vips_foreign_save_heif_build( VipsObject *object )
 	}
 
 	chroma = heif->subsample_mode == VIPS_FOREIGN_SUBSAMPLE_OFF ||
-		( heif->subsample_mode == VIPS_FOREIGN_SUBSAMPLE_AUTO &&
-			heif->Q >= 90 ) ? "444" : "420";
+		(heif->subsample_mode == VIPS_FOREIGN_SUBSAMPLE_AUTO &&
+			heif->Q >= 90) ? "444" : "420";
 	error = heif_encoder_set_parameter_string( heif->encoder,
 		"chroma", chroma );
 	if( error.code &&
diff --git a/libvips/foreign/vipspng.c b/libvips/foreign/vipspng.c
index ee517f79..a7bb6168 100644
--- a/libvips/foreign/vipspng.c
+++ b/libvips/foreign/vipspng.c
@@ -793,11 +793,8 @@ vips__png_header_source( VipsSource *source, VipsImage *out,
 	Read *read;
 
 	if( !(read = read_new( source, out, TRUE, unlimited )) ||
-		png2vips_header( read, out ) ) {
-		vips_error( "png2vips", _( "unable to read source %s" ),
-			vips_connection_nick( VIPS_CONNECTION( source ) ) );
+		png2vips_header( read, out ) ) 
 		return( -1 );
-	}
 
 	vips_source_minimise( source );
 
@@ -812,11 +809,8 @@ vips__png_read_source( VipsSource *source, VipsImage *out,
 
 	if( !(read = read_new( source, out, fail_on, unlimited )) ||
 		png2vips_image( read, out ) ||
-		vips_source_decode( source ) ) {
-		vips_error( "png2vips", _( "unable to read source %s" ),
-			vips_connection_nick( VIPS_CONNECTION( source ) ) );
+		vips_source_decode( source ) )
 		return( -1 );
-	}
 
 	return( 0 );
 }