diff --git wp-admin/includes/ms.php wp-admin/includes/ms.php
index 004b9b8..b62e1d0 100644
--- wp-admin/includes/ms.php
+++ wp-admin/includes/ms.php
@@ -274,22 +274,6 @@ 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.
  *
  * @since MU
diff --git wp-includes/ms-functions.php wp-includes/ms-functions.php
index 10fc11f..7a8ecfb 100644
--- wp-includes/ms-functions.php
+++ wp-includes/ms-functions.php
@@ -1988,6 +1988,22 @@ function get_upload_space_available() {
 }
 
 /**
+ * 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
  *
  * @return int of upload size limit in bytes