diff --git a/mu4e/mu4e-proc.el b/mu4e/mu4e-proc.el
index ffa38f61..afbd4571 100644
--- a/mu4e/mu4e-proc.el
+++ b/mu4e/mu4e-proc.el
@@ -339,7 +339,7 @@ or an error."
     (concat
       "cmd:find query:%s threads:%s sortfield:%s reverse:%s maxnum:%d "
       "skip-dups:%s include-related:%s")
-    (base64-encode-string query)
+    (base64-encode-string query t)
     (if threads "true" "false")
     ;; sortfield is e.g. ':subject'; this removes the ':'
     (if (null sortfield) "nil" (substring (symbol-name sortfield) 1))