diff --git a/CHANGES b/CHANGES
index e236b42772..555944c1ae 100644
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,6 @@
+3451.	[port]		Increase per thread stack size from 64K to 1M.
+			[RT #32230]
+
 3450.	[bug]		Stop logfileconfig system test spam system logs.
 			[RT #32315]
 
diff --git a/lib/isc/pthreads/thread.c b/lib/isc/pthreads/thread.c
index 4b5b4919b2..d5cb7448e1 100644
--- a/lib/isc/pthreads/thread.c
+++ b/lib/isc/pthreads/thread.c
@@ -25,7 +25,7 @@
 #include <isc/util.h>
 
 #ifndef THREAD_MINSTACKSIZE
-#define THREAD_MINSTACKSIZE		(64U * 1024)
+#define THREAD_MINSTACKSIZE		(1024U * 1024)
 #endif
 
 isc_result_t