diff --git a/wp-admin/includes/media.php b/wp-admin/includes/media.php
index 342eb528b4..b08498f9dd 100644
--- a/wp-admin/includes/media.php
+++ b/wp-admin/includes/media.php
@@ -3058,11 +3058,11 @@ function wp_media_attach_action( $parent_id, $action = 'attach' ) {
 		$location = 'upload.php';
 		if ( $referer = wp_get_referer() ) {
 			if ( false !== strpos( $referer, 'upload.php' ) ) {
-				$location = remove_query_arg( array( 'attached', 'detached' ), $referer );
+				$location = remove_query_arg( array( 'attached', 'detach' ), $referer );
 			}
 		}
 
-		$key = 'attach' === $action ? 'attached' : 'detached';
+		$key = 'attach' === $action ? 'attached' : 'detach';
 		$location = add_query_arg( array( $key => $result ), $location );
 		wp_redirect( $location );
 		exit;
diff --git a/wp-admin/upload.php b/wp-admin/upload.php
index e25b887175..6e16c75ea1 100644
--- a/wp-admin/upload.php
+++ b/wp-admin/upload.php
@@ -225,12 +225,12 @@ if ( ! empty( $_GET['posted'] ) ) {
 
 if ( ! empty( $_GET['attached'] ) && $attached = absint( $_GET['attached'] ) ) {
 	$message = sprintf( _n('Reattached %d attachment.', 'Reattached %d attachments.', $attached), $attached );
-	$_SERVER['REQUEST_URI'] = remove_query_arg( array( 'detached', 'attached' ), $_SERVER['REQUEST_URI'] );
+	$_SERVER['REQUEST_URI'] = remove_query_arg( array( 'detach', 'attached' ), $_SERVER['REQUEST_URI'] );
 }
 
-if ( ! empty( $_GET['detached'] ) && $detached = absint( $_GET['detached'] ) ) {
+if ( ! empty( $_GET['detach'] ) && $detached = absint( $_GET['detach'] ) ) {
 	$message = sprintf( _n( 'Detached %d attachment.', 'Detached %d attachments.', $detached ), $detached );
-	$_SERVER['REQUEST_URI'] = remove_query_arg( array( 'detached', 'attached' ), $_SERVER['REQUEST_URI'] );
+	$_SERVER['REQUEST_URI'] = remove_query_arg( array( 'detach', 'attached' ), $_SERVER['REQUEST_URI'] );
 }
 
 if ( ! empty( $_GET['deleted'] ) && $deleted = absint( $_GET['deleted'] ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index 00c2fa386b..5ea1c1a129 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.2-alpha-31623';
+$wp_version = '4.2-alpha-31624';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.