diff --git a/internal/bigmod/nat_amd64.go b/internal/bigmod/nat_amd64.go
index 12c1cce..e6cb1fd 100644
--- a/internal/bigmod/nat_amd64.go
+++ b/internal/bigmod/nat_amd64.go
@@ -3,4 +3,5 @@
 
 package bigmod
 
+//go:noescape
 func montgomeryLoop(d []uint, a []uint, b []uint, m []uint, m0inv uint) uint