diff --git a/bin/ax25dump.c b/bin/ax25dump.c
index f2cef90..f3df769 100644
--- a/bin/ax25dump.c
+++ b/bin/ax25dump.c
@@ -92,7 +92,7 @@ int main(int argc, char **argv) {
             goto error_client_socket;
         }
 
-        strncpy(ifreq.name, ifname, sizeof(ifreq.name));
+        strncpy(ifreq.name, ifname, sizeof(ifreq.name)-1);
 
         ifreq.state = PATTY_AX25_SOCK_PROMISC;
 
diff --git a/bin/tncd.c b/bin/tncd.c
index 3f08b8b..9f55fc6 100644
--- a/bin/tncd.c
+++ b/bin/tncd.c
@@ -109,7 +109,7 @@ static int pty_promisc(patty_client *client,
     setsockopt_request.opt = PATTY_AX25_SOCK_IF;
     setsockopt_request.len = sizeof(ifreq);
 
-    strncpy(ifreq.name, ifname, sizeof(ifreq.name));
+    strncpy(ifreq.name, ifname, sizeof(ifreq.name)-1);
     ifreq.state = PATTY_AX25_SOCK_PROMISC;
 
     call = PATTY_CLIENT_SETSOCKOPT;
diff --git a/src/server.c b/src/server.c
index 43e4a3a..acde16b 100644
--- a/src/server.c
+++ b/src/server.c
@@ -458,7 +458,7 @@ int patty_ax25_server_if_add(patty_ax25_server *server,
         goto error_if_fd;
     }
 
-    strncpy(entry->name, name, sizeof(entry->name));
+    strncpy(entry->name, name, sizeof(entry->name)-1);
 
     entry->iface = iface;