diff --git a/DS1307/DS1307.h b/DS1307/DS1307.h
index 4185fe2..0310eba 100644
--- a/DS1307/DS1307.h
+++ b/DS1307/DS1307.h
@@ -9,7 +9,11 @@
 #define	_Wire_H_
 #endif
 
-#include <WProgram.h>        
+#if defined(ARDUINO) && ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
 
 #define DS1307_I2C_ADDRESS 0x68
   
diff --git a/PCATTACH/PCATTACH.h b/PCATTACH/PCATTACH.h
index e2bee0e..f5727e9 100644
--- a/PCATTACH/PCATTACH.h
+++ b/PCATTACH/PCATTACH.h
@@ -2,7 +2,11 @@
 #define	_PCATTACH_H_ 
 #endif
 
-#include <WProgram.h>
+#if defined(ARDUINO) && ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
 #define uint_8 byte
 
 class PCATTACH {
diff --git a/Wiegand26/WIEGAND26.h b/Wiegand26/WIEGAND26.h
index 374cfb0..8be9e68 100644
--- a/Wiegand26/WIEGAND26.h
+++ b/Wiegand26/WIEGAND26.h
@@ -2,7 +2,11 @@
 #define	_WIEGAND26_H_ 
 #endif
 
-#include <WProgram.h>
+#if defined(ARDUINO) && ARDUINO >= 100
+#include "Arduino.h"
+#else
+#include "WProgram.h"
+#endif
 
 class WIEGAND26 {
 public: