diff --git a/Userland/Libraries/LibC/termios.cpp b/Userland/Libraries/LibC/termios.cpp
index a6ca212430..291dafa659 100644
--- a/Userland/Libraries/LibC/termios.cpp
+++ b/Userland/Libraries/LibC/termios.cpp
@@ -30,6 +30,13 @@ int tcsetattr(int fd, int optional_actions, const struct termios* t)
     return -1;
 }
 
+// https://pubs.opengroup.org/onlinepubs/009695399/functions/tcsendbreak.html
+int tcsendbreak([[maybe_unused]] int fd, [[maybe_unused]] int duration)
+{
+    // FIXME: Implement this for real.
+    return 0;
+}
+
 int tcflow([[maybe_unused]] int fd, [[maybe_unused]] int action)
 {
     errno = EINVAL;
@@ -41,6 +48,13 @@ int tcflush(int fd, int queue_selector)
     return ioctl(fd, TCFLSH, queue_selector);
 }
 
+// https://pubs.opengroup.org/onlinepubs/009695399/functions/tcdrain.html
+int tcdrain([[maybe_unused]] int fd)
+{
+    // FIXME: Implement this for real.
+    return 0;
+}
+
 speed_t cfgetispeed(const struct termios* tp)
 {
     return tp->c_ispeed;
diff --git a/Userland/Libraries/LibC/termios.h b/Userland/Libraries/LibC/termios.h
index 752a2c7cba..3a2382c7b9 100644
--- a/Userland/Libraries/LibC/termios.h
+++ b/Userland/Libraries/LibC/termios.h
@@ -10,8 +10,10 @@
 
 __BEGIN_DECLS
 
+int tcdrain(int fd);
 int tcgetattr(int fd, struct termios*);
 int tcsetattr(int fd, int optional_actions, const struct termios*);
+int tcsendbreak(int fd, int duration);
 int tcflow(int fd, int action);
 int tcflush(int fd, int queue_selector);