diff --git a/fvwm/expand.c b/fvwm/expand.c
index bf35b1316..b413137e6 100644
--- a/fvwm/expand.c
+++ b/fvwm/expand.c
@@ -544,7 +544,7 @@ static signed int expand_vars_extended(
 			mon2 = monitor_resolve_name(m_name);
 			if (mon2 == NULL)
 			{
-				free(rest_s);
+				free(p_free);
 				return -1;
 			}