From 007a93ec7e7aff538d2002d3bda13cd01c2e60c7 Mon Sep 17 00:00:00 2001
From: Mike Dunston <m_dunston@comcast.net>
Date: Tue, 20 Aug 2019 06:36:04 -0700
Subject: [PATCH] Update Print.cpp (#3060)

#2891
---
 cores/esp32/Print.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/cores/esp32/Print.cpp b/cores/esp32/Print.cpp
index 8c295347f..65fa1e9da 100644
--- a/cores/esp32/Print.cpp
+++ b/cores/esp32/Print.cpp
@@ -52,7 +52,7 @@ size_t Print::printf(const char *format, ...)
     va_list copy;
     va_start(arg, format);
     va_copy(copy, arg);
-    size_t len = vsnprintf(NULL, 0, format, arg);
+    size_t len = vsnprintf(NULL, 0, format, copy);
     va_end(copy);
     if(len >= sizeof(loc_buf)){
         temp = new char[len+1];
-- 
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