diff --git a/libvips/foreign/webp2vips.c b/libvips/foreign/webp2vips.c
index 55956180..ce56b38d 100644
--- a/libvips/foreign/webp2vips.c
+++ b/libvips/foreign/webp2vips.c
@@ -641,7 +641,8 @@ read_next_frame( Read *read )
 		printf( "don't blend\n" ); 
 #endif /*DEBUG*/
 
-	if( read->iter.duration != read->delay ) 
+	if( read->frame_count > 1 &&
+		read->iter.duration != read->delay ) 
 		g_warning( "webp2vips: "
 			"not all frames have equal duration" );
 
diff --git a/libvips/resample/thumbnail.c b/libvips/resample/thumbnail.c
index c0798ea8..84a58320 100644
--- a/libvips/resample/thumbnail.c
+++ b/libvips/resample/thumbnail.c
@@ -885,7 +885,8 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
 {
 	VipsThumbnailFile *file = (VipsThumbnailFile *) thumbnail;
 
-	if( vips_isprefix( "VipsForeignLoadJpeg", thumbnail->loader ) ) {
+	if( vips_isprefix( "VipsForeignLoadJpeg", thumbnail->loader ) ||
+		vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
 		return( vips_image_new_from_file( file->filename, 
 			"access", VIPS_ACCESS_SEQUENTIAL,
 			"shrink", (int) factor,
@@ -899,8 +900,7 @@ vips_thumbnail_file_open( VipsThumbnail *thumbnail, double factor )
 			NULL ) );
 	}
 	else if( vips_isprefix( "VipsForeignLoadPdf", thumbnail->loader ) ||
-		vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) ||
-		vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
+		vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) ) {
 		return( vips_image_new_from_file( file->filename, 
 			"access", VIPS_ACCESS_SEQUENTIAL,
 			"scale", factor,
@@ -1076,7 +1076,8 @@ vips_thumbnail_buffer_open( VipsThumbnail *thumbnail, double factor )
 {
 	VipsThumbnailBuffer *buffer = (VipsThumbnailBuffer *) thumbnail;
 
-	if( vips_isprefix( "VipsForeignLoadJpeg", thumbnail->loader ) ) {
+	if( vips_isprefix( "VipsForeignLoadJpeg", thumbnail->loader ) ||
+		vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
 		return( vips_image_new_from_buffer( 
 			buffer->buf->data, buffer->buf->length, buffer->option_string,
 			"access", VIPS_ACCESS_SEQUENTIAL,
@@ -1092,8 +1093,7 @@ vips_thumbnail_buffer_open( VipsThumbnail *thumbnail, double factor )
 			NULL ) );
 	}
 	else if( vips_isprefix( "VipsForeignLoadPdf", thumbnail->loader ) ||
-		vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) ||
-		vips_isprefix( "VipsForeignLoadWebp", thumbnail->loader ) ) {
+		vips_isprefix( "VipsForeignLoadSvg", thumbnail->loader ) ) {
 		return( vips_image_new_from_buffer( 
 			buffer->buf->data, buffer->buf->length, buffer->option_string,
 			"access", VIPS_ACCESS_SEQUENTIAL,