diff --git a/src/common.h b/src/common.h
index d3d48461..693fa4d9 100644
--- a/src/common.h
+++ b/src/common.h
@@ -112,6 +112,7 @@ struct Type {
 
 #define PK_LAMBDA(x) ([](VM* vm, ArgsView args) { return x; })
 #define PK_VAR_LAMBDA(x) ([](VM* vm, ArgsView args) { return VAR(x); })
+#define PK_NONE_LAMBDA(x) ([](VM* vm, ArgsView args) { x; return vm->None; })
 
 #ifdef POCKETPY_H
 #define FATAL_ERROR() throw std::runtime_error( "L" + std::to_string(__LINE__) + " FATAL_ERROR()!");