diff --git a/libavutil/xtea.c b/libavutil/xtea.c
index d4eede70f0..e729c91d31 100644
--- a/libavutil/xtea.c
+++ b/libavutil/xtea.c
@@ -39,10 +39,12 @@ static void xtea_crypt_ecb(AVXTEA *ctx, uint8_t *dst, const uint8_t *src,
                            int decrypt, uint8_t *iv)
 {
     uint32_t v0, v1;
+#if !CONFIG_SMALL
     uint32_t k0 = ctx->key[0];
     uint32_t k1 = ctx->key[1];
     uint32_t k2 = ctx->key[2];
     uint32_t k3 = ctx->key[3];
+#endif
 
     v0 = AV_RB32(src);
     v1 = AV_RB32(src + 4);