diff --git a/wp-admin/includes/ms.php b/wp-admin/includes/ms.php
index 004b9b8b06..b62e1d0b2d 100644
--- a/wp-admin/includes/ms.php
+++ b/wp-admin/includes/ms.php
@@ -273,22 +273,6 @@ function new_user_email_admin_notice() {
 }
 add_action( 'admin_notices', 'new_user_email_admin_notice' );
 
-/**
- * Determines if there is any upload space left in the current blog's quota.
- *
- * @since 3.0.0
- * @return bool True if space is available, false otherwise.
- */
-function is_upload_space_available() {
-	if ( get_site_option( 'upload_space_check_disabled' ) )
-		return true;
-
-	if ( !( $space_allowed = get_upload_space_available() ) )
-		return false;
-
-	return true;
-}
-
 /**
  * Check whether a blog has used its allotted upload space.
  *
diff --git a/wp-includes/ms-functions.php b/wp-includes/ms-functions.php
index 10fc11f894..7a8ecfb251 100644
--- a/wp-includes/ms-functions.php
+++ b/wp-includes/ms-functions.php
@@ -1987,6 +1987,22 @@ function get_upload_space_available() {
 	return $space_allowed - $space_used;
 }
 
+/**
+ * Determines if there is any upload space left in the current blog's quota.
+ *
+ * @since 3.0.0
+ * @return bool True if space is available, false otherwise.
+ */
+function is_upload_space_available() {
+	if ( get_site_option( 'upload_space_check_disabled' ) )
+		return true;
+
+	if ( !( $space_allowed = get_upload_space_available() ) )
+		return false;
+
+	return true;
+}
+
 /**
  * @since 3.0.0
  *