diff --git a/tests/pkd/pkd_daemon.h b/tests/pkd/pkd_daemon.h
index f3ef4e67..3b37bc5d 100644
--- a/tests/pkd/pkd_daemon.h
+++ b/tests/pkd/pkd_daemon.h
@@ -35,7 +35,7 @@ struct pkd_daemon_args {
         unsigned int iterations;
 
         struct {
-            const char *mkdtemp_str;
+            char *mkdtemp_str;
         } socket_wrapper;
     } opts;
 };
diff --git a/tests/pkd/pkd_hello.c b/tests/pkd/pkd_hello.c
index 0fa72d04..3f18b5f2 100644
--- a/tests/pkd/pkd_hello.c
+++ b/tests/pkd/pkd_hello.c
@@ -874,6 +874,8 @@ static int pkd_cleanup_socket_wrapper(void) {
         goto errrmdir;
     }
 
+    free(pkd_dargs.opts.socket_wrapper.mkdtemp_str);
+
     goto out;
 errrmdir:
 errrmfiles: