diff --git a/grub-core/lib/libgcrypt/cipher/aria.c b/grub-core/lib/libgcrypt/cipher/aria.c
index bc2d43841..cfc5a74f2 100644
--- a/grub-core/lib/libgcrypt-grub/cipher/aria.c
+++ b/grub-core/lib/libgcrypt-grub/cipher/aria.c
@@ -1013,7 +1013,7 @@ aria_crypt(ARIA_context *ctx, byte *out, const byte *in,
   return 4 * sizeof(void *) + 4 * sizeof(u32); /* stack burn depth */
 }
 
-unsigned int
+static unsigned int
 aria_encrypt(void *c, byte *outbuf, const byte *inbuf)
 {
   ARIA_context *ctx = (ARIA_context *)c;
@@ -1023,7 +1023,7 @@ aria_encrypt(void *c, byte *outbuf, const byte *inbuf)
   return aria_crypt (ctx, outbuf, inbuf, ctx->enc_key);
 }
 
-unsigned int
+static unsigned int
 aria_decrypt(void *c, byte *outbuf, const byte *inbuf)
 {
   ARIA_context *ctx = (ARIA_context *)c;