Fix CBR_BLOCK definition.

diff --git a/include/ddeml.h b/include/ddeml.h
index 5d64732..4987949 100644
--- a/include/ddeml.h
+++ b/include/ddeml.h
@@ -114,7 +114,7 @@
 #define     CBF_SKIP_DISCONNECTS         0x00200000
 #define     CBF_SKIP_ALLNOTIFICATIONS    0x003c0000
 
-#define     CBR_BLOCK			 0xFFFFFFFFL
+#define     CBR_BLOCK                    ((HDDEDATA)~0UL)
 
 /*
  * Application command flags