diff --git a/lib/FBase.C b/lib/FBase.C
index 20bfe4a..f3c657f 100644
--- a/lib/FBase.C
+++ b/lib/FBase.C
@@ -1,5 +1,9 @@
 #include <FBase.h>
 
+#ifndef MAP_NORESERVE
+#define MAP_NORESERVE 0
+#endif
+
 using namespace std;
 namespace iret {