diff --git a/cores/esp32/Arduino.h b/cores/esp32/Arduino.h
index d241bd9d..bdfbf5bb 100644
--- a/cores/esp32/Arduino.h
+++ b/cores/esp32/Arduino.h
@@ -39,6 +39,7 @@ extern "C" {
 #include "esp32-hal.h"
 #include "soc/gpio_reg.h"
 
+#include "stdlib_noniso.h"
 #include "binary.h"
 
 #define PI 3.1415926535897932384626433832795
diff --git a/cores/esp32/noniso.c b/cores/esp32/stdlib_noniso.c
similarity index 100%
rename from cores/esp32/noniso.c
rename to cores/esp32/stdlib_noniso.c