+--- a/plugin_netinfo.c
++++ b/plugin_netinfo.c
+@@ -264,7 +264,7 @@ static void my_netmask_short(RESULT * re
+ sin = get_netmask(arg1);
+ if (NULL != sin) {
+ logval = (long double) (get_netmask(arg1)->sin_addr.s_addr);
+- netlen = (int) rint(log2f(logval) / log2f(2.0));
++ netlen = (int) rint((logf(logval)/logf(2)) / (logf(2.0)/logf(2)));
+ qprintf(value, sizeof(value), "/%d", netlen);
+ } else {
+ qprintf(value, sizeof(value), "/?");