diff --git a/crypto/des/set_key.c b/crypto/des/set_key.c
index d849999..ccfad81 100644
--- a/crypto/des/set_key.c
+++ b/crypto/des/set_key.c
@@ -115,7 +115,7 @@
  * (and actual cblock values).
  */
 #define NUM_WEAK_KEY	16
-static DES_cblock weak_keys[NUM_WEAK_KEY]={
+static const DES_cblock weak_keys[NUM_WEAK_KEY]={
 	/* weak keys */
 	{0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x01},
 	{0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE,0xFE},