diff --git libs/pbd/pbd/pthread_utils.h libs/pbd/pbd/pthread_utils.h
index 6eedbd9..c459a97 100644
--- libs/pbd/pbd/pthread_utils.h
+++ libs/pbd/pbd/pthread_utils.h
@@ -49,7 +49,7 @@
 #include "pbd/signals.h"
 
 #define PBD_RT_STACKSIZE_PROC 0x20000 // 128kB
-#define PBD_RT_STACKSIZE_HELP 0x08000 // 32kB
+#define PBD_RT_STACKSIZE_HELP PBD_RT_STACKSIZE_PROC
 
 /* these are relative to sched_get_priority_max()
  * see pbd_absolute_rt_priority()
-- 
2.26.2