diff --git a/src/crypto/crypto_cipher.cc b/src/crypto/crypto_cipher.cc
index 4629143d47e492..8308c9c7928ffd 100644
--- a/src/crypto/crypto_cipher.cc
+++ b/src/crypto/crypto_cipher.cc
@@ -906,7 +906,7 @@ bool PublicKeyCipher::Cipher(
     void* label = OPENSSL_memdup(oaep_label.data(), oaep_label.size());
     CHECK_NOT_NULL(label);
     if (0 >= EVP_PKEY_CTX_set0_rsa_oaep_label(ctx.get(),
-                reinterpret_cast<unsigned char*>(label),
+                     static_cast<unsigned char*>(label),
                                       oaep_label.size())) {
       OPENSSL_free(label);
       return false;
diff --git a/src/crypto/crypto_rsa.cc b/src/crypto/crypto_rsa.cc
index 5fa91cce1a6ad2..5bbeb01ab58ac7 100644
--- a/src/crypto/crypto_rsa.cc
+++ b/src/crypto/crypto_rsa.cc
@@ -210,7 +210,10 @@ WebCryptoCipherStatus RSA_Cipher(
   if (label_len > 0) {
     void* label = OPENSSL_memdup(params.label.get(), label_len);
     CHECK_NOT_NULL(label);
-    if (EVP_PKEY_CTX_set0_rsa_oaep_label(ctx.get(), label, label_len) <= 0) {
+    if (EVP_PKEY_CTX_set0_rsa_oaep_label(
+      ctx.get(),
+      static_cast<unsigned char*>(label),
+      label_len) <= 0) {
       OPENSSL_free(label);
       return WebCryptoCipherStatus::FAILED;
     }