diff --git a/build-aux/check-mescc.sh b/build-aux/check-mescc.sh
index 499d3230..82c85d55 100755
--- a/build-aux/check-mescc.sh
+++ b/build-aux/check-mescc.sh
@@ -1,7 +1,7 @@
 #! /bin/sh
 
 # GNU Mes --- Maxwell Equations of Software
-# Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+# Copyright © 2017,2018,2019,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 #
 # This file is part of GNU Mes.
 #
@@ -105,6 +105,7 @@ lib/tests/mes/50-itoa.c
 lib/tests/posix/50-getenv.c
 lib/tests/stdlib/50-malloc.c
 lib/tests/string/50-strcmp.c
+lib/tests/string/50-strcmp-itoa.c
 lib/tests/string/50-strcpy.c
 lib/tests/string/50-strncmp.c
 lib/tests/posix/50-open-read.c
diff --git a/lib/tests/string/50-strcmp-itoa.c b/lib/tests/string/50-strcmp-itoa.c
new file mode 100644
index 00000000..6a56ef63
--- /dev/null
+++ b/lib/tests/string/50-strcmp-itoa.c
@@ -0,0 +1,47 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
+ *
+ * This file is part of GNU Mes.
+ *
+ * GNU Mes is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or (at
+ * your option) any later version.
+ *
+ * GNU Mes is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <mes/lib.h>
+
+#include <string.h>
+
+int
+main ()
+{
+  char *p = "mes";
+
+  oputs ("t: itoa (33) == \"33\"\n");
+  if (strcmp (itoa (33), "33"))
+    return 1;
+
+  oputs ("strcmp (itoa (-1), \"-1\")\n");
+  if (strcmp (itoa (-1), "-1"))
+    return 2;
+
+  oputs ("strcmp (itoa (0), \"0\")\n");
+  if (strcmp (itoa (0), "0"))
+    return 3;
+
+  oputs ("strcmp (itoa (1), \"1\")\n");
+  if (strcmp (itoa (1), "1"))
+    return 4;
+
+  return 0;
+}
diff --git a/lib/tests/string/50-strcmp.c b/lib/tests/string/50-strcmp.c
index bef3939c..b1106743 100644
--- a/lib/tests/string/50-strcmp.c
+++ b/lib/tests/string/50-strcmp.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 © 2017,2018,2020 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
  *
  * This file is part of GNU Mes.
  *
@@ -48,21 +48,5 @@ ok1:
   return 4;
 ok2:
 
-  oputs ("t: itoa (33) == \"33\"\n");
-  if (strcmp (itoa (33), "33"))
-    return 5;
-
-  oputs ("strcmp (itoa (-1), \"-1\")\n");
-  if (strcmp (itoa (-1), "-1"))
-    return 6;
-
-  oputs ("strcmp (itoa (0), \"0\")\n");
-  if (strcmp (itoa (0), "0"))
-    return 7;
-
-  oputs ("strcmp (itoa (1), \"1\")\n");
-  if (strcmp (itoa (1), "1"))
-    return 8;
-
   return 0;
 }