diff --git a/src/plugin.ts b/src/plugin.ts
index ab7a1f1d..ccb2b300 100644
--- a/src/plugin.ts
+++ b/src/plugin.ts
@@ -247,7 +247,7 @@ export class Plugin implements IPlugin {
       try {
         m = require(p)
       } catch (err) {
-        if (err.code === 'MODULE_NOT_FOUND') return
+        if (!opts.must && err.code === 'MODULE_NOT_FOUND') return
         throw err
       }
       const cmd = search(m)