diff --git a/CHANGES b/CHANGES
index 3e0b634..1e5d16a 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,4 +1,10 @@
 
+Corrections:
+	Header of xiotermios_speed() declared parameter unsigned int instead of
+	speed_t, thus compiling failed on MacOS
+	Thanks to Joe Strout and others for reporting this bug.
+	Thanks to Andrew Childs and others for sending a patch.
+
 ####################### V 1.7.3.3:
 
 Corrections:
diff --git a/xio-termios.h b/xio-termios.h
index a288a2f..9858aab 100644
--- a/xio-termios.h
+++ b/xio-termios.h
@@ -148,7 +148,7 @@ extern int xiotermiosflag_applyopt(int fd, struct opt *opt);
 extern int xiotermios_value(int fd, int word, tcflag_t mask, tcflag_t value);
 extern int xiotermios_char(int fd, int n, unsigned char c);
 #ifdef HAVE_TERMIOS_ISPEED
-extern int xiotermios_speed(int fd, int n, unsigned int speed);
+extern int xiotermios_speed(int fd, int n, speed_t speed);
 #endif
 extern int xiotermios_spec(int fd, int optcode);
 extern int xiotermios_flush(int fd);