diff --git a/main/src/h2root.cxx b/main/src/h2root.cxx
index feec224c4b0e7c5a9431b5dd49a25e8ca134646b..1c49cb8dd6697eddfccbecbd885ed358e8f7b2cb 100644
--- a/main/src/h2root.cxx
+++ b/main/src/h2root.cxx
@@ -59,6 +59,7 @@ extern "C" int rzcl[11];
 #else
 // on windows /pawc/ must have the same length as in libPacklib.a !!
 #define PAWC_SIZE 4000000
+#  define bigbuf BIGBUF
 #  define pawc   PAWC
 #  define quest  QUEST
 #  define hcbits HCBITS