src/runtime/testdata/testprog/syscall_windows.go  | 5 ++++-
 src/runtime/testdata/testprogcgo/stack_windows.go | 5 ++++-

diff --git a/src/runtime/testdata/testprog/syscall_windows.go b/src/runtime/testdata/testprog/syscall_windows.go
index b4b66441b834a41a49b99a45dad1e2c0df049fb0..71bf384dc10a0dfb7ad6277efc7dc8525231f683 100644
--- a/src/runtime/testdata/testprog/syscall_windows.go
+++ b/src/runtime/testdata/testprog/syscall_windows.go
@@ -66,5 +66,8 @@ 	mem2, err := getPagefileUsage()
 	if err != nil {
 		panic(err)
 	}
-	print((mem2 - mem1) / threadCount)
+	// assumes that this process creates 1 thread for each
+	// thread locked goroutine plus extra 5 threads
+	// like sysmon and others
+	print((mem2 - mem1) / (threadCount + 5))
 }
diff --git a/src/runtime/testdata/testprogcgo/stack_windows.go b/src/runtime/testdata/testprogcgo/stack_windows.go
index 846297a960c4b9ff1328b5cfb7b9cce88abe53c4..0be1126bee93df6245268343b3d0749cfb9675b6 100644
--- a/src/runtime/testdata/testprogcgo/stack_windows.go
+++ b/src/runtime/testdata/testprogcgo/stack_windows.go
@@ -50,5 +50,8 @@ 	mem2, err := getPagefileUsage()
 	if err != nil {
 		panic(err)
 	}
-	print((mem2 - mem1) / threadCount)
+	// assumes that this process creates 1 thread for each
+	// thread locked goroutine plus extra 5 threads
+	// like sysmon and others
+	print((mem2 - mem1) / (threadCount + 5))
 }