diff --git a/crt/aws-crt-cpp/crt/aws-c-cal/source/unix/openssl_platform_init.c b/crt/aws-crt-cpp/crt/aws-c-cal/source/unix/openssl_platform_init.c
index 761455b..fc434ba 100644
--- a/crt/aws-crt-cpp/crt/aws-c-cal/source/unix/openssl_platform_init.c
+++ b/crt/aws-crt-cpp/crt/aws-c-cal/source/unix/openssl_platform_init.c
@@ -44,7 +44,7 @@ extern void HMAC_CTX_init(HMAC_CTX *) __attribute__((weak, used));
 extern void HMAC_CTX_cleanup(HMAC_CTX *) __attribute__((weak, used));
 extern int HMAC_Update(HMAC_CTX *, const unsigned char *, size_t) __attribute__((weak, used));
 extern int HMAC_Final(HMAC_CTX *, unsigned char *, unsigned int *) __attribute__((weak, used));
-extern int HMAC_Init_ex(HMAC_CTX *, const void *, size_t, const EVP_MD *, ENGINE *) __attribute__((weak, used));
+//extern int HMAC_Init_ex(HMAC_CTX *, const void *, size_t, const EVP_MD *, ENGINE *) __attribute__((weak, used));
 
 static int s_hmac_init_ex_bssl(HMAC_CTX *ctx, const void *key, size_t key_len, const EVP_MD *md, ENGINE *impl) {
     AWS_PRECONDITION(ctx);