diff --git a/include/tins/radiotap.h b/include/tins/radiotap.h
index 778f0d6..caf9ccd 100644
--- a/include/tins/radiotap.h
+++ b/include/tins/radiotap.h
@@ -45,7 +45,7 @@ namespace Tins {
      * By default, RadioTap PDUs set the necesary fields to send an 802.11
      * PDU as its inner pdu, avoiding packet drops. As a consequence, 
      * the FCS-at-end flag is on, the channel is set to 1, TSFT is set to 0,
-     * dbm_signal is set to 0xce, and the rx_flag and antenna fields to 0.
+     * dbm_signal is set to -50, and the rx_flag and antenna fields to 0.
      */
     class RadioTap : public PDU {
     public:
diff --git a/src/dhcpv6.cpp b/src/dhcpv6.cpp
index 3a2dda8..e45d7ac 100644
--- a/src/dhcpv6.cpp
+++ b/src/dhcpv6.cpp
@@ -201,7 +201,7 @@ DHCPv6::status_code_type DHCPv6::status_code() const {
 }
 
 bool DHCPv6::has_rapid_commit() const {
-    return static_cast<bool>(search_option(RAPID_COMMIT));
+    return search_option(RAPID_COMMIT) != NULL;
 }
 
 DHCPv6::user_class_type DHCPv6::user_class() const {
@@ -225,7 +225,7 @@ uint8_t DHCPv6::reconfigure_msg() const {
 }
 
 bool DHCPv6::has_reconfigure_accept() const {
-    return static_cast<bool>(search_option(RECONF_ACCEPT));
+    return search_option(RECONF_ACCEPT) != NULL;
 }
 
 DHCPv6::duid_type DHCPv6::client_id() const {
diff --git a/src/radiotap.cpp b/src/radiotap.cpp
index 29e010e..f7210ed 100644
--- a/src/radiotap.cpp
+++ b/src/radiotap.cpp
@@ -178,7 +178,7 @@ void RadioTap::init() {
     channel(Utils::channel_to_mhz(1), 0xa0);
     flags(FCS);
     tsft(0);
-    dbm_signal(static_cast<int8_t>(0xce));
+    dbm_signal(-50);
     rx_flags(0);
     antenna(0);
 }
diff --git a/src/tcp.cpp b/src/tcp.cpp
index 49dba48..d3a50a9 100644
--- a/src/tcp.cpp
+++ b/src/tcp.cpp
@@ -147,7 +147,7 @@ void TCP::sack_permitted() {
 }
 
 bool TCP::has_sack_permitted() const {
-    return static_cast<bool>(search_option(SACK_OK));
+    return search_option(SACK_OK) != NULL;
 }
 
 void TCP::sack(const sack_type &edges) {