diff --git a/libs/ardour/session_transport.cc b/libs/ardour/session_transport.cc
index 3ab5c64f6e..8831c364b2 100644
--- a/libs/ardour/session_transport.cc
+++ b/libs/ardour/session_transport.cc
@@ -76,7 +76,7 @@ using namespace PBD;
 # define ENSURE_PROCESS_THREAD                           \
   do {                                                   \
     if (!AudioEngine::instance()->in_process_thread()) { \
-      PBD::stacktrace (std::cerr, 10);                   \
+      PBD::stacktrace (std::cerr, 20);                   \
     }                                                    \
   } while (0)
 #endif