diff --git a/scripts/chroot-fixups/openssl-public-header-files.sh b/scripts/chroot-fixups/openssl-public-header-files.sh
new file mode 100755
index 00000000..f5b198b8
--- /dev/null
+++ b/scripts/chroot-fixups/openssl-public-header-files.sh
@@ -0,0 +1,9 @@
+#!/bin/sh
+
+if test -w /usr/include/openssl/e_os2.h; then
+    (set -x
+
+    # behave as if the code was preprocessed with -DDEBUG_UNUSED
+    sed -i /usr/include/openssl/e_os2.h \
+        -e 's|\(# *if\)def DEBUG_UNUSED|\1 1|')
+fi