diff --git a/LiquidCrystal.h b/LiquidCrystal.h
index f66ec1b..572c139 100755
--- a/LiquidCrystal.h
+++ b/LiquidCrystal.h
@@ -2,6 +2,7 @@
 #define LiquidCrystal_h
 
 #include <inttypes.h>
+#include "WProgram.h"
 #include "Print.h"
 
 // commands