diff --git a/phpBB/includes/acp/acp_prune.php b/phpBB/includes/acp/acp_prune.php
index 9e680e4714..484c936be5 100644
--- a/phpBB/includes/acp/acp_prune.php
+++ b/phpBB/includes/acp/acp_prune.php
@@ -301,9 +301,14 @@ class acp_prune
 					}
 
 					add_log('admin', $l_log, implode(', ', $usernames));
+					$msg = $user->lang['USER_' . strtoupper($action) . '_SUCCESS'];
+				}
+				else
+				{
+					$msg = $user->lang['USER_PRUNE_FAILURE'];
 				}
 
-				trigger_error($user->lang['USER_' . strtoupper($action) . '_SUCCESS'] . adm_back_link($this->u_action));
+				trigger_error($msg . adm_back_link($this->u_action));
 			}
 			else
 			{
diff --git a/phpBB/language/en/acp/prune.php b/phpBB/language/en/acp/prune.php
index aec44a86c9..ad2a998c21 100644
--- a/phpBB/language/en/acp/prune.php
+++ b/phpBB/language/en/acp/prune.php
@@ -48,6 +48,7 @@ $lang = array_merge($lang, array(
 
 	'USER_DEACTIVATE_SUCCESS'	=> 'The selected users have been deactivated successfully.',
 	'USER_DELETE_SUCCESS'		=> 'The selected users have been deleted successfully.',
+	'USER_PRUNE_FAILURE'		=> 'No users fit the selected criteria.',
 
 	'WRONG_ACTIVE_JOINED_DATE'	=> 'The date entered is wrong, it is expected in <kbd>YYYY-MM-DD</kbd> format.',
 ));