diff --git a/crypto/evp/e_des3.c b/crypto/evp/e_des3.c
index 07a5aca60..127230579 100644
--- a/crypto/evp/e_des3.c
+++ b/crypto/evp/e_des3.c
@@ -241,7 +241,7 @@ static int des_ede_init_key(EVP_CIPHER_CTX *ctx, const unsigned char *key,
     DES_cblock *deskey = (DES_cblock *)key;
 #  ifdef EVP_CHECK_DES_KEY
     if (DES_set_key_checked(&deskey[0], &data(ctx)->ks1)
-        ! !DES_set_key_checked(&deskey[1], &data(ctx)->ks2))
+        || DES_set_key_checked(&deskey[1], &data(ctx)->ks2))
         return 0;
 #  else
     DES_set_key_unchecked(&deskey[0], &data(ctx)->ks1);