diff --git a/libs/pbd/debug.cc b/libs/pbd/debug.cc
index c145a9c9e3..cc691221a4 100644
--- a/libs/pbd/debug.cc
+++ b/libs/pbd/debug.cc
@@ -31,6 +31,7 @@
 
 #include "pbd/debug.h"
 #include "pbd/error.h"
+#include "pbd/pthread_utils.h"
 
 #include "pbd/i18n.h"
 
@@ -102,6 +103,10 @@ PBD::new_debug_bit (const char* name)
 void
 PBD::debug_only_print (const char* prefix, string str)
 {
+	if ((PBD::debug_bits & DEBUG::Threads).any()) {
+		printf ("0x%x (%s) ", (int) DEBUG_THREAD_SELF, pthread_name());
+	}
+
 	if ((PBD::debug_bits & DEBUG::DebugTimestamps).any()) {
 		printf ("%ld %s: %s", g_get_monotonic_time(), prefix, str.c_str());
 	} else {