diff --git a/bin/fastify-schema-to-typescript.js b/bin/fastify-schema-to-typescript.js
index ceddecb..83fa3be 100644
--- a/bin/fastify-schema-to-typescript.js
+++ b/bin/fastify-schema-to-typescript.js
@@ -38,8 +38,18 @@ program
     "file extension to use for generated files",
     parseExtension,
     ".ts"
+  )
+  .option(
+    "-m, --module <value>",
+    "module to import the RouteHandler type from",
+    "fastify"
   );
 
 program.parse(process.argv);
 
-convert({ glob: program.glob, prefix: program.prefix, ext: program.ext });
+convert({
+  glob: program.glob,
+  prefix: program.prefix,
+  ext: program.ext,
+  module: program.module,
+});
diff --git a/src/index.ts b/src/index.ts
index 2f788a4..8def18c 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -11,6 +11,7 @@ export interface Options {
   glob: string;
   prefix: string;
   ext: string;
+  module: string;
 }
 
 export async function generateReplyInterfaces(
@@ -49,7 +50,7 @@ async function generateInterfaces(
  * Instead, modify the corresponding JSONSchema file and regenerate the types.
  */
 
-import { RouteHandler } from "fastify"
+import { RouteHandler } from "${options.module}"
 
 import schema from './${parsedPath.base}'