diff --git a/core/Addfunc.cc b/core/Addfunc.cc
index 149dc29766d0431c4f1dedca4d9d9703bd8baf59..8e3eaade1e227f1e3b6b8aa5735f02f39e82e7cc 100644
--- a/core/Addfunc.cc
+++ b/core/Addfunc.cc
@@ -48,6 +48,10 @@
 
 #define ERRMSG_BUFSIZE 512
 
+#ifndef INFINITY
+#define INFINITY (DBL_MAX*DBL_MAX)
+#endif
+
 // table to reverse the hex digits within an octet
 // input: ABCDEFGH, output: DCBAHGFE
 static const unsigned char nibble_reverse_table[] =