diff --git a/src/ssl.c b/src/ssl.c
index 29e2f2bd9..5a6ee7bc9 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -6681,7 +6681,7 @@ int wolfSSL_check_private_key(const WOLFSSL* ssl)
     buff = ssl->buffers.certificate->buffer;
     InitDecodedCert(&der, buff, size, ssl->heap);
 #ifdef HAVE_PK_CALLBACKS
-    ret = InitSigPkCb(ssl, &der.sigCtx);
+    ret = InitSigPkCb((WOLFSSL*)ssl, &der.sigCtx);
     if (ret != 0) {
         FreeDecodedCert(&der);
         return ret;
@@ -6690,7 +6690,7 @@ int wolfSSL_check_private_key(const WOLFSSL* ssl)
 
     if (ParseCertRelative(&der, CERT_TYPE, NO_VERIFY, NULL) != 0) {
     #ifdef HAVE_PK_CALLBACKS
-        FreeSigPkCb(ssl, &der.sigCtx);
+        FreeSigPkCb((WOLFSSL*)ssl, &der.sigCtx);
     #endif
         FreeDecodedCert(&der);
         return WOLFSSL_FAILURE;
@@ -6700,7 +6700,7 @@ int wolfSSL_check_private_key(const WOLFSSL* ssl)
     buff = ssl->buffers.key->buffer;
     ret  = wc_CheckPrivateKey(buff, size, &der);
 #ifdef HAVE_PK_CALLBACKS
-    FreeSigPkCb(ssl, &der.sigCtx);
+    FreeSigPkCb((WOLFSSL*)ssl, &der.sigCtx);
 #endif
     FreeDecodedCert(&der);
     return ret;