diff --git a/libs/pbd/crossthread.posix.cc b/libs/pbd/crossthread.posix.cc
index 08db4debb2..3fe2f2bd43 100644
--- a/libs/pbd/crossthread.posix.cc
+++ b/libs/pbd/crossthread.posix.cc
@@ -20,8 +20,8 @@
 #include <poll.h>
 
 CrossThreadChannel::CrossThreadChannel (bool non_blocking)
-        : receive_channel (0)
-        , receive_source (0)
+	: receive_channel (0)
+	, receive_source (0)
 {
 	fds[0] = -1;
 	fds[1] = -1;
@@ -43,7 +43,7 @@ CrossThreadChannel::CrossThreadChannel (bool non_blocking)
 		}
 	}
 
-        receive_channel = g_io_channel_unix_new (fds[0]);
+	receive_channel = g_io_channel_unix_new (fds[0]);
 }
 
 CrossThreadChannel::~CrossThreadChannel ()
@@ -57,9 +57,9 @@ CrossThreadChannel::~CrossThreadChannel ()
 	}
 
 	if (receive_channel) {
-                g_io_channel_unref (receive_channel);
-                receive_channel = 0;
-        }
+		g_io_channel_unref (receive_channel);
+		receive_channel = 0;
+	}
 
 	if (fds[0] >= 0) {
 		close (fds[0]);
@@ -76,7 +76,7 @@ void
 CrossThreadChannel::wakeup ()
 {
 	char c = 0;
-	(void) ::write (fds[1], &c, 1);
+	(void)::write (fds[1], &c, 1);
 }
 
 void
@@ -89,16 +89,16 @@ CrossThreadChannel::drain ()
 int
 CrossThreadChannel::deliver (char msg)
 {
-        return ::write (fds[1], &msg, 1);
+	return ::write (fds[1], &msg, 1);
 }
 
 bool
-CrossThreadChannel::poll_for_request()
+CrossThreadChannel::poll_for_request ()
 {
 	struct pollfd pfd;
-	pfd.fd = fds[0];
-	pfd.events = POLLIN|POLLERR|POLLHUP|POLLNVAL;
-	while(true) {
+	pfd.fd     = fds[0];
+	pfd.events = POLLIN | POLLERR | POLLHUP | POLLNVAL;
+	while (true) {
 #ifdef __APPLE__
 		/* on macOS poll() will not return when the pipe
 		 * is closed in an EOF state. ork around with a timeout.
@@ -134,5 +134,5 @@ CrossThreadChannel::receive (char& msg, bool wait)
 			return -1;
 		}
 	}
-        return ::read (fds[0], &msg, 1);
+	return ::read (fds[0], &msg, 1);
 }