diff --git a/src/preprocessor.js b/src/preprocessor.js
index eef343b2dda0dedd63012214a1ba6b82fe86195b..b388ada0bd471c3d90b3f59d0ad23d2ae6269c76 100644
--- a/src/preprocessor.js
+++ b/src/preprocessor.js
@@ -320,8 +320,8 @@ function img_to_picture(content, node, image) {
 
 	res += `<img ${serialize_img_attributes(content, attributes, {
 		src: to_value(image.img.src),
-		width: image.img.w,
-		height: image.img.h
+		width: image.img.w / 2,
+		height: image.img.h / 2
 	})} />`;
 
 	return (res += '</picture>');
@@ -354,8 +354,8 @@ function dynamic_img_to_picture(content, node, src_var_name) {
 
 	const details = {
 		src: `{${src_var_name}.img.src}`,
-		width: `{${src_var_name}.img.w}`,
-		height: `{${src_var_name}.img.h}`
+		width: `{${src_var_name}.img.w / 2}`,
+		height: `{${src_var_name}.img.h / 2}`
 	};
 
 	return `{#if typeof ${src_var_name} === 'string'}