diff --git a/config.h b/config.h
index 9d3a351f2..1660e2f53 100644
--- a/config.h
+++ b/config.h
@@ -25,7 +25,7 @@
 
 // Version number
 // (must not contain capital letters)
-#define LASAURGRBL_VERSION "12.10"
+#define LASAURGRBL_VERSION "13.01"
 // build for new driveboard hardware
 #define DRIVEBOARD
 #define BAUD_RATE 57600
diff --git a/stepper.c b/stepper.c
index db19ec0c2..1f70b4e36 100644
--- a/stepper.c
+++ b/stepper.c
@@ -40,6 +40,8 @@
   Speed adjustments are made ACCELERATION_TICKS_PER_SECOND times per second.  
 */
 
+#define __DELAY_BACKWARD_COMPATIBLE__  // _delay_us() make backward compatible see delay.h
+  
 #include <math.h>
 #include <stdlib.h>
 #include <util/delay.h>