diff --git a/libfreerdp/core/certificate.c b/libfreerdp/core/certificate.c
index b4ccd2367..abb8426c7 100644
--- a/libfreerdp/core/certificate.c
+++ b/libfreerdp/core/certificate.c
@@ -698,6 +698,7 @@ rdpRsaKey* key_new(const char* keyfile)
 
 	BIO_free(bio);
 	free(buffer);
+	buffer = NULL;
 
 	if (!rsa)
 	{