diff --git a/ext/readline/readline.c b/ext/readline/readline.c
index b9435521ca8..174556d4d3f 100644
--- a/ext/readline/readline.c
+++ b/ext/readline/readline.c
@@ -441,6 +441,7 @@ PHP_FUNCTION(readline_list_history)
 				}
 			}
 		}
+		free(hs);
     }
 
 #else /* readline */