diff --git a/lib/src/legacy/legacy_h26x_auth.c b/lib/src/legacy/legacy_h26x_auth.c
index 112adff..c494618 100644
--- a/lib/src/legacy/legacy_h26x_auth.c
+++ b/lib/src/legacy/legacy_h26x_auth.c
@@ -117,7 +117,7 @@ legacy_verify_hashes_with_hash_list(legacy_sv_t *self,
   assert(hash_size > 0);
   // Expected hashes.
   uint8_t *expected_hashes = self->gop_info->hash_list;
-  const int num_expected_hashes = self->gop_info->list_idx / hash_size;
+  const int num_expected_hashes = (const int)(self->gop_info->list_idx / hash_size);
 
   legacy_h26x_nalu_list_t *nalu_list = self->nalu_list;
   legacy_h26x_nalu_list_item_t *last_used_item = NULL;
diff --git a/lib/src/signed_video_h26x_auth.c b/lib/src/signed_video_h26x_auth.c
index f4e3380..7132033 100644
--- a/lib/src/signed_video_h26x_auth.c
+++ b/lib/src/signed_video_h26x_auth.c
@@ -293,7 +293,7 @@ verify_hashes_with_hash_list(signed_video_t *self,
   assert(hash_size > 0);
   // Expected hashes.
   uint8_t *expected_hashes = self->gop_info->hash_list;
-  const int num_expected_hashes = self->gop_info->list_idx / hash_size;
+  const int num_expected_hashes = (const int)(self->gop_info->list_idx / hash_size);
 
   h26x_nalu_list_t *nalu_list = self->nalu_list;
   h26x_nalu_list_item_t *last_used_item = NULL;
diff --git a/lib/src/signed_video_h26x_common.c b/lib/src/signed_video_h26x_common.c
index b04ba6d..db2a650 100644
--- a/lib/src/signed_video_h26x_common.c
+++ b/lib/src/signed_video_h26x_common.c
@@ -967,7 +967,7 @@ check_and_copy_hash_to_hash_list(signed_video_t *self, const uint8_t *hash, size
   // a valid |hash_list| exists, and the |hash| can be copied to it.
   if (*list_idx >= 0) {
     memcpy(&hash_list[*list_idx], hash, hash_size);
-    *list_idx += hash_size;
+    *list_idx += (int)hash_size;
   }
   openssl_update_hash(self->crypto_handle, hash, hash_size, true);
 }
diff --git a/lib/src/signed_video_h26x_nalu_list.c b/lib/src/signed_video_h26x_nalu_list.c
index 0f76a94..a44938e 100644
--- a/lib/src/signed_video_h26x_nalu_list.c
+++ b/lib/src/signed_video_h26x_nalu_list.c
@@ -324,7 +324,7 @@ h26x_nalu_list_copy_last_item(h26x_nalu_list_t *list, bool hash_algo_known)
   while (!(item->nalu)) {
     item = item->prev;
   }
-  int hashable_data_offset = item->nalu->hashable_data - item->nalu->nalu_data;
+  int hashable_data_offset = (int)(item->nalu->hashable_data - item->nalu->nalu_data);
 
   svrc_t status = SV_UNKNOWN_FAILURE;
   SV_TRY()
diff --git a/lib/src/signed_video_openssl.c b/lib/src/signed_video_openssl.c
index 4c66d95..c6784db 100644
--- a/lib/src/signed_video_openssl.c
+++ b/lib/src/signed_video_openssl.c
@@ -108,7 +108,7 @@ openssl_private_key_malloc(sign_or_verify_data_t *sign_data,
   svrc_t status = SV_UNKNOWN_FAILURE;
   SV_TRY()
     // Read private key
-    BIO *bp = BIO_new_mem_buf(private_key, private_key_size);
+    BIO *bp = BIO_new_mem_buf(private_key, (int)private_key_size);
     signing_key = PEM_read_bio_PrivateKey(bp, NULL, NULL, NULL);
     BIO_free(bp);
     SV_THROW_IF(!signing_key, SV_EXTERNAL_ERROR);
@@ -406,7 +406,7 @@ oid_to_type(message_digest_t *self)
     // Point to the first byte of the OID. The |oid_ptr| will increment while decoding.
     encoded_oid_ptr = self->encoded_oid;
     SV_THROW_IF(
-        !d2i_ASN1_OBJECT(&obj, &encoded_oid_ptr, self->encoded_oid_size), SV_EXTERNAL_ERROR);
+        !d2i_ASN1_OBJECT(&obj, &encoded_oid_ptr, (long)self->encoded_oid_size), SV_EXTERNAL_ERROR);
     self->type = EVP_get_digestbyobj(obj);
     self->size = EVP_MD_size(self->type);
   SV_CATCH()
@@ -531,7 +531,7 @@ openssl_encoded_oid_to_str(const unsigned char *encoded_oid, size_t encoded_oid_
   }
 
   // Point to the first byte of the OID. The |oid_ptr| will increment while decoding.
-  if (!d2i_ASN1_OBJECT(&obj, &encoded_oid, encoded_oid_size)) {
+  if (!d2i_ASN1_OBJECT(&obj, &encoded_oid, (long)encoded_oid_size)) {
     goto done;
   }
   OBJ_obj2txt(algo_name, 50, obj, 1);