diff --git a/common/rfb/Configuration.cxx b/common/rfb/Configuration.cxx
index 418a0c9..619c4d5 100644
--- a/common/rfb/Configuration.cxx
+++ b/common/rfb/Configuration.cxx
@@ -338,7 +338,7 @@
 IntParameter::setParam(const char* v) {
   if (immutable) return true;
   vlog.debug("set %s(Int) to %s", getName(), v);
-  int i = atoi(v);
+  int i = strtol(v, NULL, 0);
   if (i < minValue || i > maxValue)
     return false;
   value = i;