diff --git a/libs/pbd/crossthread.posix.cc b/libs/pbd/crossthread.posix.cc
index 5035bc49da..573671ba99 100644
--- a/libs/pbd/crossthread.posix.cc
+++ b/libs/pbd/crossthread.posix.cc
@@ -29,6 +29,14 @@ CrossThreadChannel::CrossThreadChannel (bool non_blocking)
 
 CrossThreadChannel::~CrossThreadChannel ()
 {
+	if (receive_source) {
+		/* this disconnects it from any main context it was attached in
+		   in ::attach(), this prevent its callback from being invoked
+		   after the destructor has finished.
+		*/
+		g_source_destroy (receive_source);
+	}
+
 	if (receive_channel) {
                 g_io_channel_unref (receive_channel);
                 receive_channel = 0;
diff --git a/libs/pbd/crossthread.win.cc b/libs/pbd/crossthread.win.cc
index 5eca5fb4e8..60572bde70 100644
--- a/libs/pbd/crossthread.win.cc
+++ b/libs/pbd/crossthread.win.cc
@@ -89,6 +89,14 @@ CrossThreadChannel::CrossThreadChannel (bool non_blocking)
 
 CrossThreadChannel::~CrossThreadChannel ()
 {
+	if (receive_source) {
+		/* this disconnects it from any main context it was attached in
+		   in ::attach(), this prevent its callback from being invoked
+		   after the destructor has finished.
+		*/
+		g_source_destroy (receive_source);
+	}
+
 	/* glibmm hack */
 
 	if (receive_channel) {