diff --git a/proto/pointer_unsafe.go b/proto/pointer_unsafe.go
index ceece77..6b5567d 100644
--- a/proto/pointer_unsafe.go
+++ b/proto/pointer_unsafe.go
@@ -126,6 +126,10 @@
 }
 
 // ExtMap returns the address of an extension map field in the struct.
+func structPointer_Extensions(p structPointer, f field) *XXX_InternalExtensions {
+	return (*XXX_InternalExtensions)(unsafe.Pointer(uintptr(p) + uintptr(f)))
+}
+
 func structPointer_ExtMap(p structPointer, f field) *map[int32]Extension {
 	return (*map[int32]Extension)(unsafe.Pointer(uintptr(p) + uintptr(f)))
 }