diff --git a/src/map.c b/src/map.c
index d063e05..2b213cf 100644
--- a/src/map.c
+++ b/src/map.c
@@ -1711,7 +1711,7 @@
     }
 
     // Note: the evaluation may make "mp" invalid.
-    p = eval_to_string(expr, FALSE);
+    p = eval_to_string(expr, FALSE, FALSE);
 
     --textlock;
     --ex_normal_lock;