diff --git a/models/Thumbnail.php b/models/Thumbnail.php
index 5dca12c5..22987354 100644
--- a/models/Thumbnail.php
+++ b/models/Thumbnail.php
@@ -109,7 +109,7 @@ class Thumbnail
 		if (!$this->height)
 			$this->height = ceil($this->width / $this->image->ratio());
 		elseif (!$this->width)
-			$this->width = ceil($this->height / $this->image->ratio());
+			$this->width = ceil($this->height * $this->image->ratio());
 
 		// Inferring the height from the original image's ratio?
 		if (!$fit)