diff --git a/src/imgio.c b/src/imgio.c
index 85f794b..15fc6f2 100644
--- a/src/imgio.c
+++ b/src/imgio.c
@@ -218,7 +218,7 @@ inherit_from_jpeg(const JPEG* in, const char fmt)
 {
 	PPM image = { .width = in->width,
 		      .height = in->height,
-		      .len = in->width * in->height,
+		      .len = in->len,
 		      .fmt = fmt };
 	return image;
 }
@@ -229,7 +229,7 @@ inherit_from_ppm(const PPM* in)
 	JPEG image = {
 		.width = in->width,
 		.height = in->height,
-		.len = in->width * in->height,
+		.len = in->len,
 	};
 	return image;
 }