diff --git a/build-aux/check-mescc.sh b/build-aux/check-mescc.sh
index 5fd89a1e..fb6557b8 100755
--- a/build-aux/check-mescc.sh
+++ b/build-aux/check-mescc.sh
@@ -107,6 +107,7 @@ lib/tests/scaffold/47-function-expression.c
 lib/tests/scaffold/48-global-static.c
 lib/tests/assert/50-assert.c
 lib/tests/mes/50-itoa.c
+lib/tests/scaffold/50-compare-rotated-weird.c
 lib/tests/posix/50-getenv.c
 lib/tests/stdlib/50-malloc.c
 lib/tests/string/50-memcmp.c
diff --git a/lib/tests/scaffold/50-compare-rotated-weird.c b/lib/tests/scaffold/50-compare-rotated-weird.c
new file mode 100644
index 00000000..bd354891
--- /dev/null
+++ b/lib/tests/scaffold/50-compare-rotated-weird.c
@@ -0,0 +1,40 @@
+/* -*-comment-start: "//";comment-end:""-*-
+ * GNU Mes --- Maxwell Equations of Software
+ * Copyright © 2023 Ekaitz Zarraga <ekaitz@elenq.tech>
+ *
+ * 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 <stdint.h>
+#include <mes/lib.h>
+#include <string.h>
+
+int
+main ()
+{
+  uint64_t val = 0x27c1c;
+  uint64_t addr = 0x28bb4;
+  uint64_t off64 = (int64_t)((int64_t)(val - addr + 0x800) >> 12);
+  uint64_t cond = (off64 + ((uint64_t)1 << 20)) >> 21;
+  if (cond)
+    {
+      eputs ("failure: ");
+      eputs (itoa (cond));
+      eputs ("\n");
+      return 2;
+    }
+  return 0;
+}