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-rw-r--r--crypto/des/des.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/crypto/des/des.h b/crypto/des/des.h
index 18ceaa2a25..392d8bbea0 100644
--- a/crypto/des/des.h
+++ b/crypto/des/des.h
@@ -63,6 +63,10 @@
extern "C" {
#endif
+#ifdef NO_DES
+#error DES is disabled.
+#endif
+
#include <stdio.h>
#include <openssl/opensslconf.h> /* DES_LONG */