diff --git a/sysoptions.h b/sysoptions.h
index 7cf3784cf412234da993a43d6c6c2751923c6bcf..8f9066965345d78b75c4cb46c5fd8dc72a6bfa4c 100644
--- a/sysoptions.h
+++ b/sysoptions.h
@@ -92,8 +92,10 @@
 #if defined(DROPBEAR_ECDH) || defined (DROPBEAR_ECDSA)
 #define DROPBEAR_ECC
 /* Debian doesn't define this in system headers */
+#ifndef LTM_DESC
 #define LTM_DESC
 #endif
+#endif
 
 #ifdef DROPBEAR_ECC
 #define DROPBEAR_ECC_256