diff --git a/platform/src/ssl_utils.cpp b/platform/src/ssl_utils.cpp
index 51dc169..280fdac 100644
--- a/platform/src/ssl_utils.cpp
+++ b/platform/src/ssl_utils.cpp
@@ -666,12 +666,10 @@ X509 * ssl_x509_forge(X509 * cacrt, EVP_PKEY * cakey, X509 * origcrt, EVP_PKEY *
 	if (rv == -1)
 		goto errout;
 
-	rv = ssl_x509_v3ext_copy_by_nid(crt, origcrt,
-		NID_key_usage);
-	if (rv == 0)
-		rv = ssl_x509_v3ext_add(&ctx, crt, "keyUsage",
-			"digitalSignature,"
-			"keyEncipherment");
+	//Not copy keyUsage, because RSA is not compatibel with "Key Agreement".
+	rv = ssl_x509_v3ext_add(&ctx, crt, "keyUsage",
+		"digitalSignature,"
+		"keyEncipherment");
 	if (rv == -1)
 		goto errout;