diff --git a/ssl/ssl_aead_ctx.cc b/ssl/ssl_aead_ctx.cc
index 6a25780..335f6f4 100644
--- a/ssl/ssl_aead_ctx.cc
+++ b/ssl/ssl_aead_ctx.cc
@@ -55,7 +55,7 @@
 }
 
 UniquePtr<SSLAEADContext> SSLAEADContext::Create(
-    enum evp_aead_direction_t direction, uint16_t version, int is_dtls,
+    enum evp_aead_direction_t direction, uint16_t version, bool is_dtls,
     const SSL_CIPHER *cipher, Span<const uint8_t> enc_key,
     Span<const uint8_t> mac_key, Span<const uint8_t> fixed_iv) {
   const EVP_AEAD *aead;