diff --git a/src/krb5_plugin/passkey/passkey_clpreauth.c b/src/krb5_plugin/passkey/passkey_clpreauth.c
index 345b8b85c0e..aa7b2d929d2 100644
--- a/src/krb5_plugin/passkey/passkey_clpreauth.c
+++ b/src/krb5_plugin/passkey/passkey_clpreauth.c
@@ -365,6 +365,9 @@ sss_passkeycl_process(krb5_context context,
     if (reply != NULL) {
         free(reply);
     }
+    if (prompt_reply != NULL) {
+        free(prompt_reply);
+    }
     return ret;
 }