diff --git a/wp-includes/class-wp-image-editor-imagick.php b/wp-includes/class-wp-image-editor-imagick.php
index 34dd539375..3589cc22a1 100644
--- a/wp-includes/class-wp-image-editor-imagick.php
+++ b/wp-includes/class-wp-image-editor-imagick.php
@@ -550,7 +550,9 @@ class WP_Image_Editor_Imagick extends WP_Image_Editor {
 			$this->image->rotateImage( new ImagickPixel('none'), 360-$angle );
 
 			// Normalise Exif orientation data so that display is consistent across devices.
-			$this->image->setImageOrientation( Imagick::ORIENTATION_TOPLEFT );
+			if ( is_callable( array( $this->image, 'setImageOrientation' ) ) && defined( 'Imagick::ORIENTATION_TOPLEFT' ) ) {
+				$this->image->setImageOrientation( Imagick::ORIENTATION_TOPLEFT );
+			}
 
 			// Since this changes the dimensions of the image, update the size.
 			$result = $this->update_size();
diff --git a/wp-includes/version.php b/wp-includes/version.php
index ea1b8ffc52..c927d9f382 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.8-alpha-40128';
+$wp_version = '4.8-alpha-40129';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.