diff --git a/include/binder/IBinder.h b/include/binder/IBinder.h
index 43b6543..607c18b 100644
--- a/include/binder/IBinder.h
+++ b/include/binder/IBinder.h
@@ -17,14 +17,17 @@
 #ifndef ANDROID_IBINDER_H
 #define ANDROID_IBINDER_H
 
+#include <cstdlib>  // Defines types needed for linux/binder.h
+#include <linux/binder.h>  // Needed for B_PACK_CHARS
+
 #include <utils/Errors.h>
 #include <utils/RefBase.h>
 #include <utils/String16.h>
 #include <utils/Vector.h>
 
-
-#define B_PACK_CHARS(c1, c2, c3, c4) \
-    ((((c1)<<24)) | (((c2)<<16)) | (((c3)<<8)) | (c4))
+#ifndef B_PACK_CHARS
+#error "linux/binder.h no longer defines B_PACK_CHARS"
+#endif
 
 // ---------------------------------------------------------------------------
 namespace android {