Update Print.cpp (#3060)

#2891
espressif · Aug 20, 2019 · 007a93e · 007a93e
1 parent a5f3fc6
commit 007a93e
Showing 1 changed file with 1 addition and 1 deletion.
diff --git 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];