diff --git a/contrib/res_limit/main.php b/contrib/res_limit/main.php
index 75c0d53c..98e90ee4 100644
--- a/contrib/res_limit/main.php
+++ b/contrib/res_limit/main.php
@@ -14,6 +14,7 @@ class ResolutionLimit extends Extension {
 			$min_h = $config->get_int("upload_min_height", -1);
 			$max_w = $config->get_int("upload_max_width", -1);
 			$max_h = $config->get_int("upload_max_height", -1);
+			$ratios = explode(" ", $config->get_string("upload_ratios", ""));
 			
 			$image = $event->image;
 
@@ -21,6 +22,22 @@ class ResolutionLimit extends Extension {
 			if($min_h > 0 && $image->height < $min_h) $event->veto("Image too small");
 			if($max_w > 0 && $image->width > $min_w) $event->veto("Image too large");
 			if($max_h > 0 && $image->height > $min_h) $event->veto("Image too large");
+
+			if(count($ratios) > 0) {
+				$ok = false;
+				foreach($ratios as $ratio) {
+					$parts = explode(":", $ratio);
+					$width = $parts[0];
+					$height = $parts[1];
+					if($image->width / $width == $image->height / $height) {
+						$ok = true;
+						break;
+					}
+				}
+				if(!$ok) {
+					$event->veto("Image needs to be in one of these ratios: ".html_escape($config->get_string("upload_ratios", "")));
+				}
+			}
 		}
 		if(is_a($event, 'SetupBuildingEvent')) {
 			$sb = new SetupBlock("Resolution Limits");
@@ -39,6 +56,10 @@ class ResolutionLimit extends Extension {
 			
 			$sb->add_label("<br>(-1 for no limit)");
 
+			$sb->add_label("<br>Ratios ");
+			$sb->add_text_option("upload_ratios");
+			$sb->add_label("<br>(eg. '4:3 16:9', blank for no limit)");
+			
 			$event->panel->add_block($sb);
 		}
 	}