diff --git a/arch/x86/crypto/poly1305_glue.c b/arch/x86/crypto/poly1305_glue.c
index e32142bc071d..28c372003e44 100644
--- a/arch/x86/crypto/poly1305_glue.c
+++ b/arch/x86/crypto/poly1305_glue.c
@@ -164,7 +164,6 @@ static struct shash_alg alg = {
 	.init		= poly1305_simd_init,
 	.update		= poly1305_simd_update,
 	.final		= crypto_poly1305_final,
-	.setkey		= crypto_poly1305_setkey,
 	.descsize	= sizeof(struct poly1305_simd_desc_ctx),
 	.base		= {
 		.cra_name		= "poly1305",
diff --git a/crypto/poly1305_generic.c b/crypto/poly1305_generic.c
index b1c2d57dc734..ba39eb308c79 100644
--- a/crypto/poly1305_generic.c
+++ b/crypto/poly1305_generic.c
@@ -47,17 +47,6 @@ int crypto_poly1305_init(struct shash_desc *desc)
 }
 EXPORT_SYMBOL_GPL(crypto_poly1305_init);
 
-int crypto_poly1305_setkey(struct crypto_shash *tfm,
-			   const u8 *key, unsigned int keylen)
-{
-	/* Poly1305 requires a unique key for each tag, which implies that
-	 * we can't set it on the tfm that gets accessed by multiple users
-	 * simultaneously. Instead we expect the key as the first 32 bytes in
-	 * the update() call. */
-	return -ENOTSUPP;
-}
-EXPORT_SYMBOL_GPL(crypto_poly1305_setkey);
-
 static void poly1305_setrkey(struct poly1305_desc_ctx *dctx, const u8 *key)
 {
 	/* r &= 0xffffffc0ffffffc0ffffffc0fffffff */
@@ -76,6 +65,11 @@ static void poly1305_setskey(struct poly1305_desc_ctx *dctx, const u8 *key)
 	dctx->s[3] = get_unaligned_le32(key + 12);
 }
 
+/*
+ * Poly1305 requires a unique key for each tag, which implies that we can't set
+ * it on the tfm that gets accessed by multiple users simultaneously. Instead we
+ * expect the key as the first 32 bytes in the update() call.
+ */
 unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
 					const u8 *src, unsigned int srclen)
 {
@@ -281,7 +275,6 @@ static struct shash_alg poly1305_alg = {
 	.init		= crypto_poly1305_init,
 	.update		= crypto_poly1305_update,
 	.final		= crypto_poly1305_final,
-	.setkey		= crypto_poly1305_setkey,
 	.descsize	= sizeof(struct poly1305_desc_ctx),
 	.base		= {
 		.cra_name		= "poly1305",
diff --git a/include/crypto/poly1305.h b/include/crypto/poly1305.h
index c65567d01e8e..f718a19da82f 100644
--- a/include/crypto/poly1305.h
+++ b/include/crypto/poly1305.h
@@ -31,8 +31,6 @@ struct poly1305_desc_ctx {
 };
 
 int crypto_poly1305_init(struct shash_desc *desc);
-int crypto_poly1305_setkey(struct crypto_shash *tfm,
-			   const u8 *key, unsigned int keylen);
 unsigned int crypto_poly1305_setdesckey(struct poly1305_desc_ctx *dctx,
 					const u8 *src, unsigned int srclen);
 int crypto_poly1305_update(struct shash_desc *desc,