diff --git a/libs/ardour/ardour/triggerbox.h b/libs/ardour/ardour/triggerbox.h
index ddf56345e0..c804d41e49 100644
--- a/libs/ardour/ardour/triggerbox.h
+++ b/libs/ardour/ardour/triggerbox.h
@@ -27,6 +27,7 @@
 
 #include <glibmm/threads.h>
 
+#include "pbd/pcg_rand.h"
 #include "pbd/stateful.h"
 #include "pbd/ringbuffer.h"
 
@@ -245,6 +246,8 @@ class LIBARDOUR_API TriggerBox : public Processor
 	Glib::Threads::RWLock trigger_lock; /* protects all_triggers */
 	Triggers all_triggers;
 
+	PBD::PCGRand _pcg;
+
 	/* These three are accessed (read/write) only from process() context */
 
 	void drop_triggers ();
diff --git a/libs/ardour/triggerbox.cc b/libs/ardour/triggerbox.cc
index ea3c728453..1a6bc20b65 100644
--- a/libs/ardour/triggerbox.cc
+++ b/libs/ardour/triggerbox.cc
@@ -8,7 +8,6 @@
 #include "pbd/basename.h"
 #include "pbd/compose.h"
 #include "pbd/failed_constructor.h"
-#include "pbd/pcg_rand.h"
 
 #include "temporal/tempo.h"
 
@@ -990,8 +989,7 @@ TriggerBox::set_next_trigger (size_t current)
 	}
 
 	int which_follow_action;
-	PCGRand pcg;
-	int r = pcg.rand (0, 101);
+	int r = _pcg.rand (0, 101);
 
 	if (r <= all_triggers[current]->follow_action_probability()) {
 		which_follow_action = 0;
@@ -1079,7 +1077,7 @@ TriggerBox::set_next_trigger (size_t current)
 
 	case Trigger::AnyTrigger:
 		while (true) {
-			n = pcg.rand (0, all_triggers.size() + 1);
+			n = _pcg.rand (0, all_triggers.size() + 1);
 			if (!all_triggers[n]->region()) {
 				continue;
 			}
@@ -1093,7 +1091,7 @@ TriggerBox::set_next_trigger (size_t current)
 
 	case Trigger::OtherTrigger:
 		while (true) {
-			n = pcg.rand (0, all_triggers.size() + 1);
+			n = _pcg.rand (0, all_triggers.size() + 1);
 			if ((size_t) n == current) {
 				continue;
 			}