diff --git a/src/MyFirstUDRKit.h b/src/MyFirstUDRKit.h
index 7ee1ecb..4aa7bc4 100644
--- a/src/MyFirstUDRKit.h
+++ b/src/MyFirstUDRKit.h
@@ -13,6 +13,7 @@
 #include <cstdio>
 
 
+static const size_t MaxSegmentSize = 65535;
 
 
 // This should be used in only one of the UDR library files.