diff --git a/grbl/defaults.h b/grbl/defaults.h
index 08370af..2093f11 100644
--- a/grbl/defaults.h
+++ b/grbl/defaults.h
@@ -36,7 +36,7 @@
   #define DEFAULT_X_MAX_RATE 				1000.0 // mm/min
   #define DEFAULT_Y_MAX_RATE 				1000.0 // mm/min
   #define DEFAULT_Z_MAX_RATE 				1000.0 // mm/min
-  #define DEFAULT_X_ACCELERATION 			(800.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
+  #define DEFAULT_X_ACCELERATION 			(20.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
   #define DEFAULT_Y_ACCELERATION 			(20.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
   #define DEFAULT_Z_ACCELERATION 			(20.0*60*60) // 10*60*60 mm/min^2 = 10 mm/sec^2
   #define DEFAULT_X_MAX_TRAVEL 				400.0 // mm NOTE: Must be a positive value.