diff --git a/wolfcrypt/src/port/atmel/atmel.c b/wolfcrypt/src/port/atmel/atmel.c
index 9b7b97a00..c2445d724 100644
--- a/wolfcrypt/src/port/atmel/atmel.c
+++ b/wolfcrypt/src/port/atmel/atmel.c
@@ -736,7 +736,7 @@ exit:
  * \brief Verify signature received from peers to prove peer's private key.
  */
 int atcatls_verify_signature_cb(WOLFSSL* ssl, const byte* sig, unsigned int sigSz,
-    const byte* hash, word32 unsigned int, const byte* key, unsigned int keySz, int* result,
+    const byte* hash, unsigned int hashSz, const byte* key, unsigned int keySz, int* result,
     void* ctx)
 {
     int ret;
diff --git a/wolfssl/wolfcrypt/port/atmel/atmel.h b/wolfssl/wolfcrypt/port/atmel/atmel.h
index 598bebac4..5e4c2777d 100644
--- a/wolfssl/wolfcrypt/port/atmel/atmel.h
+++ b/wolfssl/wolfcrypt/port/atmel/atmel.h
@@ -124,7 +124,7 @@ int  atmel_ecc_verify(const byte* message, const byte* signature,
     int atcatls_sign_certificate_cb(WOLFSSL* ssl, const byte* in, unsigned int inSz,
         byte* out, word32* outSz, const byte* key, unsigned int keySz, void* ctx);
     int atcatls_verify_signature_cb(WOLFSSL* ssl, const byte* sig, unsigned int sigSz,
-        const byte* hash, word32 unsigned int, const byte* key, unsigned int keySz,
+        const byte* hash, unsigned int hashSz, const byte* key, unsigned int keySz,
         int* result, void* ctx);
 
     int atcatls_set_callbacks(struct WOLFSSL_CTX* ctx);