diff --git a/src/TinyProtocol.h b/src/TinyProtocol.h
index 3d7d34a9..59052dbe 100644
--- a/src/TinyProtocol.h
+++ b/src/TinyProtocol.h
@@ -59,7 +59,7 @@ namespace tinyproto
 class Proto
 {
 public:
-    Proto(bool multithread = false);
+    explicit Proto(bool multithread = false);
 
     ~Proto();
 
@@ -132,7 +132,7 @@ class Proto
 class SerialFdProto: public Proto
 {
 public:
-    SerialFdProto(HardwareSerial &port);
+    explicit SerialFdProto(HardwareSerial &port);
 
     ArduinoSerialFdLink &getLink();
 
@@ -143,7 +143,7 @@ class SerialFdProto: public Proto
 class SerialHdlcProto: public Proto
 {
 public:
-    SerialHdlcProto(HardwareSerial &port);
+    explicit SerialHdlcProto(HardwareSerial &port);
 
     ArduinoSerialHdlcLink &getLink();
 
@@ -156,7 +156,7 @@ class SerialHdlcProto: public Proto
 class SerialFdProto: public Proto
 {
 public:
-    SerialFdProto(char *dev, bool multithread = false);
+    explicit SerialFdProto(char *dev, bool multithread = false);
 
     SerialFdLink &getLink();
 
@@ -167,7 +167,7 @@ class SerialFdProto: public Proto
 class SerialHdlcProto: public Proto
 {
 public:
-    SerialHdlcProto(char *dev, bool multithread = false);
+    explicit SerialHdlcProto(char *dev, bool multithread = false);
 
     SerialHdlcLink &getLink();
 
diff --git a/src/link/TinySerialFdLink.h b/src/link/TinySerialFdLink.h
index e33b959b..32e63379 100644
--- a/src/link/TinySerialFdLink.h
+++ b/src/link/TinySerialFdLink.h
@@ -32,7 +32,7 @@ namespace tinyproto
 template <int MTU, int TX_WINDOW, int BUFFER_SIZE, int BLOCK> class StaticSerialFdLink: public ISerialLinkLayer<IFdLinkLayer, BLOCK>
 {
 public:
-    StaticSerialFdLink(char *dev)
+    explicit StaticSerialFdLink(char *dev)
         : ISerialLinkLayer<IFdLinkLayer, BLOCK>(dev, this->m_buffer, BUFFER_SIZE)
     {
         this->setMtu(MTU);
@@ -40,7 +40,7 @@ template <int MTU, int TX_WINDOW, int BUFFER_SIZE, int BLOCK> class StaticSerial
     }
 
 private:
-    uint8_t m_buffer[BUFFER_SIZE];
+    uint8_t m_buffer[BUFFER_SIZE] = {};
 };
 
 
@@ -52,7 +52,7 @@ template <int MTU, int TX_WINDOW, int RX_WINDOW, int BLOCK> using ArduinoStaticS
 class ArduinoSerialFdLink: public ArduinoStaticSerialFdLinkLayer<32, 2, 2, 4>
 {
 public:
-    ArduinoSerialFdLink(HardwareSerial *dev)
+    explicit ArduinoSerialFdLink(HardwareSerial *dev)
         : ArduinoStaticSerialFdLinkLayer<32, 2, 2, 4>(reinterpret_cast<char *>(dev))
     {
     }
@@ -63,7 +63,7 @@ class ArduinoSerialFdLink: public ArduinoStaticSerialFdLinkLayer<32, 2, 2, 4>
 class SerialFdLink: public ISerialLinkLayer<IFdLinkLayer, 32>
 {
 public:
-    SerialFdLink(char *dev)
+    explicit SerialFdLink(char *dev)
         : ISerialLinkLayer<IFdLinkLayer, 32>(dev, nullptr, 0)
     {
     }
diff --git a/src/link/TinySerialHdlcLink.h b/src/link/TinySerialHdlcLink.h
index afa9e8fb..1133a0f7 100644
--- a/src/link/TinySerialHdlcLink.h
+++ b/src/link/TinySerialHdlcLink.h
@@ -32,14 +32,14 @@ namespace tinyproto
 template <int MTU, int BUFFER_SIZE, int BLOCK> class StaticSerialHdlcLink: public ISerialLinkLayer<IHdlcLinkLayer, BLOCK>
 {
 public:
-    StaticSerialHdlcLink(char *dev)
+    explicit StaticSerialHdlcLink(char *dev)
         : ISerialLinkLayer<IHdlcLinkLayer, BLOCK>(dev, this->m_buffer, BUFFER_SIZE)
     {
         this->setMtu(MTU);
     }
 
 private:
-    uint8_t m_buffer[BUFFER_SIZE];
+    uint8_t m_buffer[BUFFER_SIZE] = {};
 };
 
 
@@ -51,7 +51,7 @@ template <int MTU, int RX_WINDOW, int BLOCK> using ArduinoStaticSerialHdlcLinkLa
 class ArduinoSerialHdlcLink: public ArduinoStaticSerialHdlcLinkLayer<32, 2, 4>
 {
 public:
-    ArduinoSerialHdlcLink(HardwareSerial *dev)
+    explicit ArduinoSerialHdlcLink(HardwareSerial *dev)
         : ArduinoStaticSerialHdlcLinkLayer<32, 2, 4>(reinterpret_cast<char *>(dev))
     {
     }
@@ -62,7 +62,7 @@ class ArduinoSerialHdlcLink: public ArduinoStaticSerialHdlcLinkLayer<32, 2, 4>
 class SerialHdlcLink: public ISerialLinkLayer<IHdlcLinkLayer, 32>
 {
 public:
-    SerialHdlcLink(char *dev)
+    explicit SerialHdlcLink(char *dev)
         : ISerialLinkLayer<IHdlcLinkLayer, 32>(dev, nullptr, 0)
     {
     }
diff --git a/src/proto/fd/tiny_fd.c b/src/proto/fd/tiny_fd.c
index 4cfc051d..4c489226 100644
--- a/src/proto/fd/tiny_fd.c
+++ b/src/proto/fd/tiny_fd.c
@@ -914,7 +914,7 @@ static uint8_t *tiny_fd_get_next_i_frame(tiny_fd_handle_t handle, int *len, uint
 
 static uint8_t *tiny_fd_get_next_frame_to_send(tiny_fd_handle_t handle, int *len, uint8_t peer)
 {
-    uint8_t *data = NULL;
+    uint8_t *data;
     // Tx data available
     tiny_mutex_lock(&handle->frames.mutex);
     const uint8_t address = __peer_to_address_field( handle, peer );
diff --git a/tinyproto.cppcheck b/tinyproto.cppcheck
index 51436466..5fb5fa23 100644
--- a/tinyproto.cppcheck
+++ b/tinyproto.cppcheck
@@ -10,5 +10,7 @@
     </libraries>
     <suppressions>
         <suppression>purgedConfiguration</suppression>
+        <suppression>nullPointerArithmeticRedundantCheck</suppression>
+        <suppression>ctuOneDefinitionRuleViolation</suppression>
     </suppressions>
 </project>