diff --git a/crypto/digest/digest.c b/crypto/digest/digest.c
index dfa40bd..fdd9fe5 100644
--- a/crypto/digest/digest.c
+++ b/crypto/digest/digest.c
@@ -231,11 +231,11 @@
   return ctx->digest;
 }
 
-unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
+size_t EVP_MD_CTX_size(const EVP_MD_CTX *ctx) {
   return EVP_MD_size(EVP_MD_CTX_md(ctx));
 }
 
-unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
+size_t EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx) {
   return EVP_MD_block_size(EVP_MD_CTX_md(ctx));
 }
 
diff --git a/include/openssl/digest.h b/include/openssl/digest.h
index 80028ef..9a5ec51 100644
--- a/include/openssl/digest.h
+++ b/include/openssl/digest.h
@@ -218,11 +218,11 @@
 
 /* EVP_MD_CTX_size returns the digest size of |ctx|, in bytes. It
  * will crash if a digest hasn't been set on |ctx|. */
-OPENSSL_EXPORT unsigned EVP_MD_CTX_size(const EVP_MD_CTX *ctx);
+OPENSSL_EXPORT size_t EVP_MD_CTX_size(const EVP_MD_CTX *ctx);
 
 /* EVP_MD_CTX_block_size returns the block size of the digest function used by
  * |ctx|, in bytes. It will crash if a digest hasn't been set on |ctx|. */
-OPENSSL_EXPORT unsigned EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx);
+OPENSSL_EXPORT size_t EVP_MD_CTX_block_size(const EVP_MD_CTX *ctx);
 
 /* EVP_MD_CTX_type returns a NID describing the digest function used by |ctx|.
  * (For example, |NID_sha256|.) It will crash if a digest hasn't been set on