diff --git a/include/sniffer.h b/include/sniffer.h
index d59100c..7d5f319 100644
--- a/include/sniffer.h
+++ b/include/sniffer.h
@@ -66,10 +66,10 @@ namespace Tins {
          * \brief Creates an instance of sniffer.
          * \param device The device which will be sniffed.
          * \param max_packet_size The maximum packet size to be read.
-         * \param timeout The time in seconds to wait for a packet.
+         * \param promisc bool indicating wether to put the interface in promiscuous mode.
          * \param filter A capture filter to compile and use for sniffing sessions.(optional);
          */
-        Sniffer(const std::string &device, unsigned max_packet_size, unsigned timeout = 0, const std::string &filter = "") throw(std::runtime_error);
+        Sniffer(const std::string &device, unsigned max_packet_size, bool promisc = false, const std::string &filter = "") throw(std::runtime_error);
         
         /**
          * \brief Sniffer destructor.
diff --git a/src/sniffer.cpp b/src/sniffer.cpp
index 1ecba9e..0daa047 100644
--- a/src/sniffer.cpp
+++ b/src/sniffer.cpp
@@ -40,13 +40,13 @@ struct LoopData {
 /** \endcond */
 
 
-Tins::Sniffer::Sniffer(const string &device, unsigned max_packet_size, unsigned timeout, const string &filter) throw(std::runtime_error) {
+Tins::Sniffer::Sniffer(const string &device, unsigned max_packet_size, bool promisc, const string &filter) throw(std::runtime_error) {
     char error[PCAP_ERRBUF_SIZE];
     if (pcap_lookupnet(device.c_str(), &ip, &mask, error) == -1) {
         ip = 0;
         mask = 0;
     }
-    handle = pcap_open_live(device.c_str(), max_packet_size, 0, timeout, error);
+    handle = pcap_open_live(device.c_str(), max_packet_size, promisc, 0, error);
     if(!handle)
         throw runtime_error(error);
     wired = (pcap_datalink (handle) != DLT_IEEE802_11_RADIO); //better plx