diff --git a/src/os_unix.c b/src/os_unix.c
index d155142..b7da552 100644
--- a/src/os_unix.c
+++ b/src/os_unix.c
@@ -7722,6 +7722,34 @@
 }
 #endif // FEAT_SYSMOUSE
 
+/*
+ * Fill the buffer 'buf' with 'len' random bytes.
+ * Returns FAIL if the OS PRNG is not available or something went wrong.
+ */
+    int
+mch_get_random(char_u *buf, int len)
+{
+    static int dev_urandom_state = NOTDONE;
+
+    if (dev_urandom_state == FAIL)
+	return FAIL;
+
+    int fd = open("/dev/urandom", O_RDONLY);
+
+    // Attempt reading /dev/urandom.
+    if (fd == -1)
+	dev_urandom_state = FAIL;
+    else if (read(fd, buf, len) == len)
+	dev_urandom_state = OK;
+    else
+    {
+	dev_urandom_state = FAIL;
+	close(fd);
+    }
+
+    return dev_urandom_state;
+}
+
 #if defined(FEAT_LIBCALL) || defined(PROTO)
 typedef char_u * (*STRPROCSTR)(char_u *);
 typedef char_u * (*INTPROCSTR)(int);