diff --git a/src/ParserState.ts b/src/ParserState.ts
index eedb654..d96ff1d 100644
--- a/src/ParserState.ts
+++ b/src/ParserState.ts
@@ -14,6 +14,7 @@ export type ParserState = {
 export const createNewParserState = (typechecker: ts.TypeChecker, config: Ts2PyConfig): ParserState => {
   const knownTypes = new Map<ts.Type, string>();
   knownTypes.set(typechecker.getVoidType(), "None");
+  knownTypes.set(typechecker.getNullType(), "None");
   knownTypes.set(typechecker.getUndefinedType(), "None");
   knownTypes.set(typechecker.getStringType(), "str");
   knownTypes.set(typechecker.getBooleanType(), "bool");
diff --git a/src/testing/basic.test.ts b/src/testing/basic.test.ts
index 73c1757..eb7ebdc 100644
--- a/src/testing/basic.test.ts
+++ b/src/testing/basic.test.ts
@@ -7,6 +7,7 @@ describe("transpiling basic types", () => {
     ["export type T = string;", "T = str"],
     ["export type T = undefined;", "T = None"],
     ["export type T = void;", "T = None"],
+    ["export type T = null;", "T = None"],
     [
       "export type T = true;",
       "from typing_extensions import Literal\n\nT = Literal[True]",