diff --git a/ref/fips202.c b/ref/fips202.c
index c710c06a..020a9b13 100644
--- a/ref/fips202.c
+++ b/ref/fips202.c
@@ -711,162 +711,3 @@ void shake256(uint8_t *output, size_t outlen,
     }
     shake256_ctx_release(&s);
 }
-
-void sha3_256_inc_init(sha3_256incctx *state) {
-    keccak_inc_init(state->ctx);
-}
-
-void sha3_256_inc_ctx_clone(sha3_256incctx *dest, const sha3_256incctx *src) {
-    memcpy(dest->ctx, src->ctx, SPX_SHAKEINCCTX_BYTES);
-}
-
-void sha3_256_inc_ctx_release(sha3_256incctx *state) {
-    (void)state; // avoid unused variable warnings
-}
-
-void sha3_256_inc_absorb(sha3_256incctx *state, const uint8_t *input, size_t inlen) {
-    keccak_inc_absorb(state->ctx, SHA3_256_RATE, input, inlen);
-}
-
-void sha3_256_inc_finalize(uint8_t *output, sha3_256incctx *state) {
-    uint8_t t[SHA3_256_RATE];
-    keccak_inc_finalize(state->ctx, SHA3_256_RATE, 0x06);
-
-    keccak_squeezeblocks(t, 1, state->ctx, SHA3_256_RATE);
-
-    sha3_256_inc_ctx_release(state);
-
-    for (size_t i = 0; i < 32; i++) {
-        output[i] = t[i];
-    }
-}
-
-/*************************************************
- * Name:        sha3_256
- *
- * Description: SHA3-256 with non-incremental API
- *
- * Arguments:   - uint8_t *output:      pointer to output
- *              - const uint8_t *input: pointer to input
- *              - size_t inlen:   length of input in bytes
- **************************************************/
-void sha3_256(uint8_t *output, const uint8_t *input, size_t inlen) {
-    uint64_t s[25];
-    uint8_t t[SHA3_256_RATE];
-
-    /* Absorb input */
-    keccak_absorb(s, SHA3_256_RATE, input, inlen, 0x06);
-
-    /* Squeeze output */
-    keccak_squeezeblocks(t, 1, s, SHA3_256_RATE);
-
-    for (size_t i = 0; i < 32; i++) {
-        output[i] = t[i];
-    }
-}
-
-void sha3_384_inc_init(sha3_384incctx *state) {
-    keccak_inc_init(state->ctx);
-}
-
-void sha3_384_inc_ctx_clone(sha3_384incctx *dest, const sha3_384incctx *src) {
-    memcpy(dest->ctx, src->ctx, SPX_SHAKEINCCTX_BYTES);
-}
-
-void sha3_384_inc_absorb(sha3_384incctx *state, const uint8_t *input, size_t inlen) {
-    keccak_inc_absorb(state->ctx, SHA3_384_RATE, input, inlen);
-}
-
-void sha3_384_inc_ctx_release(sha3_384incctx *state) {
-    (void)state; // avoid unused variable warnings
-}
-
-void sha3_384_inc_finalize(uint8_t *output, sha3_384incctx *state) {
-    uint8_t t[SHA3_384_RATE];
-    keccak_inc_finalize(state->ctx, SHA3_384_RATE, 0x06);
-
-    keccak_squeezeblocks(t, 1, state->ctx, SHA3_384_RATE);
-
-    sha3_384_inc_ctx_release(state);
-
-    for (size_t i = 0; i < 48; i++) {
-        output[i] = t[i];
-    }
-}
-
-/*************************************************
- * Name:        sha3_384
- *
- * Description: SHA3-256 with non-incremental API
- *
- * Arguments:   - uint8_t *output:      pointer to output
- *              - const uint8_t *input: pointer to input
- *              - size_t inlen:   length of input in bytes
- **************************************************/
-void sha3_384(uint8_t *output, const uint8_t *input, size_t inlen) {
-    uint64_t s[25];
-    uint8_t t[SHA3_384_RATE];
-
-    /* Absorb input */
-    keccak_absorb(s, SHA3_384_RATE, input, inlen, 0x06);
-
-    /* Squeeze output */
-    keccak_squeezeblocks(t, 1, s, SHA3_384_RATE);
-
-    for (size_t i = 0; i < 48; i++) {
-        output[i] = t[i];
-    }
-}
-
-void sha3_512_inc_init(sha3_512incctx *state) {
-    keccak_inc_init(state->ctx);
-}
-
-void sha3_512_inc_ctx_clone(sha3_512incctx *dest, const sha3_512incctx *src) {
-    memcpy(dest->ctx, src->ctx, SPX_SHAKEINCCTX_BYTES);
-}
-
-void sha3_512_inc_absorb(sha3_512incctx *state, const uint8_t *input, size_t inlen) {
-    keccak_inc_absorb(state->ctx, SHA3_512_RATE, input, inlen);
-}
-
-void sha3_512_inc_ctx_release(sha3_512incctx *state) {
-    (void)state; // avoid unused variable warnings
-}
-
-void sha3_512_inc_finalize(uint8_t *output, sha3_512incctx *state) {
-    uint8_t t[SHA3_512_RATE];
-    keccak_inc_finalize(state->ctx, SHA3_512_RATE, 0x06);
-
-    keccak_squeezeblocks(t, 1, state->ctx, SHA3_512_RATE);
-
-    sha3_512_inc_ctx_release(state);
-
-    for (size_t i = 0; i < 64; i++) {
-        output[i] = t[i];
-    }
-}
-
-/*************************************************
- * Name:        sha3_512
- *
- * Description: SHA3-512 with non-incremental API
- *
- * Arguments:   - uint8_t *output:      pointer to output
- *              - const uint8_t *input: pointer to input
- *              - size_t inlen:   length of input in bytes
- **************************************************/
-void sha3_512(uint8_t *output, const uint8_t *input, size_t inlen) {
-    uint64_t s[25];
-    uint8_t t[SHA3_512_RATE];
-
-    /* Absorb input */
-    keccak_absorb(s, SHA3_512_RATE, input, inlen, 0x06);
-
-    /* Squeeze output */
-    keccak_squeezeblocks(t, 1, s, SHA3_512_RATE);
-
-    for (size_t i = 0; i < 64; i++) {
-        output[i] = t[i];
-    }
-}
diff --git a/ref/fips202.h b/ref/fips202.h
index 02215c5f..57beee59 100644
--- a/ref/fips202.h
+++ b/ref/fips202.h
@@ -34,21 +34,6 @@ typedef struct {
     uint64_t ctx[SPX_SHAKECTX_BYTES];
 } shake256ctx;
 
-// Context for incremental API
-typedef struct {
-    uint64_t ctx[SPX_SHAKEINCCTX_BYTES];
-} sha3_256incctx;
-
-// Context for incremental API
-typedef struct {
-    uint64_t ctx[SPX_SHAKEINCCTX_BYTES];
-} sha3_384incctx;
-
-// Context for incremental API
-typedef struct {
-    uint64_t ctx[SPX_SHAKEINCCTX_BYTES];
-} sha3_512incctx;
-
 /* Initialize the state and absorb the provided input.
  *
  * This function does not support being called multiple times
@@ -123,45 +108,4 @@ void shake128(uint8_t *output, size_t outlen,
 void shake256(uint8_t *output, size_t outlen,
               const uint8_t *input, size_t inlen);
 
-/* Initialize the incremental hashing state */
-void sha3_256_inc_init(sha3_256incctx *state);
-/* Absorb blocks into SHA3 */
-void sha3_256_inc_absorb(sha3_256incctx *state, const uint8_t *input, size_t inlen);
-/* Obtain the output of the function and free `state` */
-void sha3_256_inc_finalize(uint8_t *output, sha3_256incctx *state);
-/* Copy the context */
-void sha3_256_inc_ctx_clone(sha3_256incctx *dest, const sha3_256incctx *src);
-/* Release the state, don't use if `_finalize` has been used */
-void sha3_256_inc_ctx_release(sha3_256incctx *state);
-
-void sha3_256(uint8_t *output, const uint8_t *input, size_t inlen);
-
-/* Initialize the incremental hashing state */
-void sha3_384_inc_init(sha3_384incctx *state);
-/* Absorb blocks into SHA3 */
-void sha3_384_inc_absorb(sha3_384incctx *state, const uint8_t *input, size_t inlen);
-/* Obtain the output of the function and free `state` */
-void sha3_384_inc_finalize(uint8_t *output, sha3_384incctx *state);
-/* Copy the context */
-void sha3_384_inc_ctx_clone(sha3_384incctx *dest, const sha3_384incctx *src);
-/* Release the state, don't use if `_finalize` has been used */
-void sha3_384_inc_ctx_release(sha3_384incctx *state);
-
-/* One-stop SHA3-384 shop */
-void sha3_384(uint8_t *output, const uint8_t *input, size_t inlen);
-
-/* Initialize the incremental hashing state */
-void sha3_512_inc_init(sha3_512incctx *state);
-/* Absorb blocks into SHA3 */
-void sha3_512_inc_absorb(sha3_512incctx *state, const uint8_t *input, size_t inlen);
-/* Obtain the output of the function and free `state` */
-void sha3_512_inc_finalize(uint8_t *output, sha3_512incctx *state);
-/* Copy the context */
-void sha3_512_inc_ctx_clone(sha3_512incctx *dest, const sha3_512incctx *src);
-/* Release the state, don't use if `_finalize` has been used */
-void sha3_512_inc_ctx_release(sha3_512incctx *state);
-
-/* One-stop SHA3-512 shop */
-void sha3_512(uint8_t *output, const uint8_t *input, size_t inlen);
-
 #endif