diff --git a/lib/tests/assert/50-assert.c b/lib/tests/assert/50-assert.c
index 6702ab10..21037999 100644
--- a/lib/tests/assert/50-assert.c
+++ b/lib/tests/assert/50-assert.c
@@ -1,6 +1,6 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
- * Copyright © 2017 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2017,2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -25,7 +25,7 @@
 int
 main ()
 {
-  int f;
+  int f = 0;
 
   puts ("\n");
   puts ("t: assert (1) ?\n");
diff --git a/lib/tests/scaffold/21-char-array.c b/lib/tests/scaffold/21-char-array.c
index a3bf9eef..2db15eb2 100644
--- a/lib/tests/scaffold/21-char-array.c
+++ b/lib/tests/scaffold/21-char-array.c
@@ -1,6 +1,6 @@
 /* -*-comment-start: "//";comment-end:""-*-
  * GNU Mes --- Maxwell Equations of Software
- * Copyright © 2017,2018 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ * Copyright © 2017,2018,2023 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -24,7 +24,7 @@ main ()
   char *s = "mes";
   if (!s[0])
     return 1;
-  int f;
+  int f = 0;
   int v = 3;
   if (!s[f])
     return 2;