diff --git a/core/components/resizer/model/vendor/oo12/reductionist/src/Reductionist/Reductionist.php b/core/components/resizer/model/vendor/oo12/reductionist/src/Reductionist/Reductionist.php
index 17b1068..1aed573 100644
--- a/core/components/resizer/model/vendor/oo12/reductionist/src/Reductionist/Reductionist.php
+++ b/core/components/resizer/model/vendor/oo12/reductionist/src/Reductionist/Reductionist.php
@@ -404,6 +404,9 @@ public function processImage($input, $output, $options = array()) {
 					$doApply = true;
 					$transformation->add(new Filter\Watermark($filter, $filterlog));
 				}
+				elseif ($filter[0] === 'gray') {
+					$image->effects()->grayscale();
+				}
 			}
 		}