diff --git a/library/camellia.c b/library/camellia.c
index 1255fa0ad..3f3b26856 100644
--- a/library/camellia.c
+++ b/library/camellia.c
@@ -458,6 +458,8 @@ void camellia_crypt_ecb( camellia_context *ctx,
     int NR;
     uint32_t *RK, X[4];
 
+    ( (void) mode );
+
     NR = ctx->nr;
     RK = ctx->rk;