diff --git a/wp-includes/class-wp-image-editor-imagick.php b/wp-includes/class-wp-image-editor-imagick.php
index 7632cbb4ba..74ba793be7 100644
--- a/wp-includes/class-wp-image-editor-imagick.php
+++ b/wp-includes/class-wp-image-editor-imagick.php
@@ -376,8 +376,8 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
 			 */
 			if ( is_callable( array( $this->image, 'getImageAlphaChannel' ) )
 				&& is_callable( array( $this->image, 'setImageAlphaChannel' ) )
-				&& defined( Imagick::ALPHACHANNEL_UNDEFINED )
-				&& defined( Imagick::ALPHACHANNEL_OPAQUE )
+				&& defined( 'Imagick::ALPHACHANNEL_UNDEFINED' )
+				&& defined( 'Imagick::ALPHACHANNEL_OPAQUE' )
 			) {
 				if ( $this->image->getImageAlphaChannel() === Imagick::ALPHACHANNEL_UNDEFINED ) {
 					$this->image->setImageAlphaChannel( Imagick::ALPHACHANNEL_OPAQUE );
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 32eaa1e31c..545ba5e447 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.6-alpha-37191';
+$wp_version = '4.6-alpha-37192';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.