diff --git a/wire/core/Pageimage.php b/wire/core/Pageimage.php
index 75f68b32..4dcdf5bd 100644
--- a/wire/core/Pageimage.php
+++ b/wire/core/Pageimage.php
@@ -547,6 +547,13 @@ class Pageimage extends Pagefile {
 			$a = @simplexml_load_string($xml)->attributes();
 			if((int) $a->width > 0) $width = (int) $a->width;
 			if((int) $a->height > 0) $height = (int) $a->height;
+			if((!$width || !$height) && $a->viewBox) {
+				$values = explode(' ', $a->viewBox);
+				if(count($values) === 4) {
+					$width = (int) round($values[2]);
+					$height = (int) round($values[3]);
+				}
+			}
 		}
 		
 		if((!$width || !$height) && (extension_loaded('imagick') || class_exists('\IMagick'))) {
@@ -1873,4 +1880,3 @@ class Pageimage extends Pagefile {
 	}
 
 }
-