diff --git a/src/ip232.c b/src/ip232.c
index 9005bcb..9fd270d 100644
--- a/src/ip232.c
+++ b/src/ip232.c
@@ -19,7 +19,6 @@ void *ip232_thread(void *arg)
   modem_config *cfg = (modem_config *) arg;
   int accept_pending = FALSE;
   int rc;
-  int res = 0;
   char buf[256];
 
   fd_set readfs;
@@ -44,7 +43,7 @@ void *ip232_thread(void *arg)
     }
     else {
       if (FD_ISSET(cfg->dce_data.dp[1][0], &readfs)) {  // pipe
-        res = read(cfg->dce_data.dp[1][0], buf, sizeof(buf) - 1);
+        read(cfg->dce_data.dp[1][0], buf, sizeof(buf) - 1);
         LOG(LOG_DEBUG, "ip232 thread notified");
         accept_pending = FALSE;
       }
diff --git a/src/nvt.c b/src/nvt.c
index d7e7466..5902a4a 100644
--- a/src/nvt.c
+++ b/src/nvt.c
@@ -14,7 +14,7 @@ void nvt_init_config(nvt_vars *vars)
   for (i = 0; i < 256; i++)
     vars->term[i] = 0;
 
-  return 0;
+  return;
 }
 
 int get_nvt_cmd_response(int action, int type)
diff --git a/src/nvt.h b/src/nvt.h
index d1b829e..2506a43 100644
--- a/src/nvt.h
+++ b/src/nvt.h
@@ -1,4 +1,4 @@
-ifndef NVT_H
+#ifndef NVT_H
 #define NVT_H 1
 
 typedef enum {
@@ -52,6 +52,6 @@ extern void nvt_init_config(nvt_vars *vars);
 extern int get_nvt_cmd_response(int action, int type);
 extern int parse_nvt_subcommand(int fd, nvt_vars *vars, unsigned char *data, int len, int speed);
 extern void send_nvt_command(int fd, nvt_vars *vars, char action, int opt);
-extern int parse_nvt_command(int fd, nvt_vars *vars, nvtCommand action, nvtOption opt, int parity);
+extern void parse_nvt_command(int fd, nvt_vars *vars, nvtCommand action, nvtOption opt, int parity);
 
 #endif
diff --git a/src/serial.c b/src/serial.c
index 8683c18..f1d2f83 100644
--- a/src/serial.c
+++ b/src/serial.c
@@ -180,6 +180,7 @@ int ser_read(int fd, char *data, int len)
 {
   int res;
 
+
   res = read(fd, data, len);
   log_trace(TRACE_MODEM_IN, data, res);
   return res;