Index: trunk/FACT++/src/zfits.cc
===================================================================
--- trunk/FACT++/src/zfits.cc	(revision 19023)
+++ trunk/FACT++/src/zfits.cc	(revision 19024)
@@ -120,6 +120,6 @@
 
     char m[2];
-    m[0] = 'z'+128;
-    m[1] = 'f'+128;
+    m[0] = 'z'|0x80;
+    m[1] = 'f'|0x80;
 
     const size_t hlen = 0;