diff --git a/src/krb5_plugin/passkey/passkey_clpreauth.c b/src/krb5_plugin/passkey/passkey_clpreauth.c
index 345b8b85c0e..06659213023 100644
--- a/src/krb5_plugin/passkey/passkey_clpreauth.c
+++ b/src/krb5_plugin/passkey/passkey_clpreauth.c
@@ -269,7 +269,7 @@ sss_passkeycl_process(krb5_context context,
     const char *state;
     char prompt_answer[255] = {0};
     int answer_len;
-    const char *prompt_reply = NULL;
+    char *prompt_reply = NULL;
     uint8_t *reply = NULL;
     const char *answer;
 
@@ -365,6 +365,9 @@ sss_passkeycl_process(krb5_context context,
     if (reply != NULL) {
         free(reply);
     }
+    if (prompt_reply != NULL) {
+        free(prompt_reply);
+    }
     return ret;
 }