diff --git a/octave.c b/octave.c
index 60cc4d8..a566521 100644
--- a/octave.c
+++ b/octave.c
@@ -336,7 +336,7 @@ int t,v;
       if (t==0) return 1;
       if ((v=isCidr(w)) > 0) { /* test si CIDR */
          addCidr(w);
-         NbAddCidrs += (int)(1<<v);
+         NbAddCidrs += (int)(1<<(32-v));
          return 1;
       }
       if ((v=isCidr6(w)) > 0) { /* test si CIDR6 */