diff --git a/dist/watch.d.ts b/dist/watch.d.ts
index 0acaa2b..bb0fca8 100644
--- a/dist/watch.d.ts
+++ b/dist/watch.d.ts
@@ -1,7 +1,7 @@
 import type { Build, BuildResult, Log, Run, Canon, ChangeItem, BuildSpec } from './types';
 import { FSWatcher } from 'chokidar';
 declare class Watch {
-    fsw: FSWatcher;
+    fsw: FSWatcher | undefined;
     wspec: any;
     last?: BuildResult;
     lastChangeTime: number;
@@ -23,6 +23,7 @@ declare class Watch {
         rem: boolean;
     };
     constructor(bspec: BuildSpec, log: Log);
+    ensureFSW(): FSWatcher;
     start(): void;
     canon(path: string): string;
     handleChange(path: string): void;
diff --git a/dist/watch.js b/dist/watch.js
index 1946c3b..e8b4f5f 100644
--- a/dist/watch.js
+++ b/dist/watch.js
@@ -14,7 +14,6 @@ class Watch {
         this.wspec = bspec;
         this.log = log;
         this.name = bspec.name || 'model';
-        this.fsw = new chokidar_1.FSWatcher();
         this.lastChangeTime = 0;
         this.runq = [];
         this.doneq = [];
@@ -30,19 +29,26 @@ class Watch {
             add: true === bspec.watch?.add,
             rem: true === bspec.watch?.rem,
         };
-        const handleChange = this.handleChange.bind(this);
-        if (this.mode.mod) {
-            this.fsw.on('change', handleChange);
-        }
-        if (this.mode.add) {
-            this.fsw.on('add', handleChange);
-        }
-        if (this.mode.rem) {
-            this.fsw.on('unlink', handleChange);
+    }
+    ensureFSW() {
+        if (!this.fsw) {
+            this.fsw = new chokidar_1.FSWatcher();
+            const handleChange = this.handleChange.bind(this);
+            if (this.mode.mod) {
+                this.fsw.on('change', handleChange);
+            }
+            if (this.mode.add) {
+                this.fsw.on('add', handleChange);
+            }
+            if (this.mode.rem) {
+                this.fsw.on('unlink', handleChange);
+            }
         }
+        return this.fsw;
     }
     // Returns first BuildResult
     start() {
+        this.ensureFSW();
         this.startTime = Date.now();
         this.handleChange('<start>');
         // Check if there have been no recent changes, if so, run build.
@@ -121,7 +127,7 @@ class Watch {
             when: Date.now()
         };
         this.canons.push(canon);
-        this.fsw.add(path);
+        this.ensureFSW().add(path);
     }
     async update(br) {
         let build = br.build ? br.build() : undefined;
@@ -202,7 +208,9 @@ class Watch {
         }
     }
     async stop() {
-        await this.fsw.close();
+        if (this.fsw) {
+            await this.fsw.close();
+        }
     }
     descDeps(deps) {
         if (null == deps) {
diff --git a/dist/watch.js.map b/dist/watch.js.map
index a39bd27..6d99ad5 100644
--- a/dist/watch.js.map
+++ b/dist/watch.js.map
@@ -1 +1 @@
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\ No newline at end of file
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\ No newline at end of file
diff --git a/package.json b/package.json
index 16a7156..8c8908c 100644
--- a/package.json
+++ b/package.json
@@ -43,7 +43,7 @@
     "LICENSE"
   ],
   "dependencies": {
-    "aontu": "0.37.0",
+    "aontu": "0.38.0",
     "chokidar": "5.0.0",
     "gubu": "^9.0.0",
     "memfs": "^4.56.11"
diff --git a/src/watch.ts b/src/watch.ts
index de9752a..eab7a74 100644
--- a/src/watch.ts
+++ b/src/watch.ts
@@ -22,7 +22,7 @@ import { stat } from 'fs/promises'
 
 
 class Watch {
-  fsw: FSWatcher
+  fsw: FSWatcher | undefined
   wspec: any
   last?: BuildResult
   lastChangeTime: number
@@ -49,7 +49,6 @@ class Watch {
     this.log = log
 
     this.name = bspec.name || 'model'
-    this.fsw = new FSWatcher()
     this.lastChangeTime = 0
     this.runq = []
     this.doneq = []
@@ -67,25 +66,34 @@ class Watch {
       add: true === bspec.watch?.add,
       rem: true === bspec.watch?.rem,
     }
+  }
 
-    const handleChange = this.handleChange.bind(this)
 
-    if (this.mode.mod) {
-      this.fsw.on('change', handleChange)
-    }
+  ensureFSW(): FSWatcher {
+    if (!this.fsw) {
+      this.fsw = new FSWatcher()
 
-    if (this.mode.add) {
-      this.fsw.on('add', handleChange)
-    }
+      const handleChange = this.handleChange.bind(this)
+
+      if (this.mode.mod) {
+        this.fsw.on('change', handleChange)
+      }
 
-    if (this.mode.rem) {
-      this.fsw.on('unlink', handleChange)
+      if (this.mode.add) {
+        this.fsw.on('add', handleChange)
+      }
+
+      if (this.mode.rem) {
+        this.fsw.on('unlink', handleChange)
+      }
     }
+    return this.fsw
   }
 
 
   // Returns first BuildResult
   start() {
+    this.ensureFSW()
     this.startTime = Date.now()
     this.handleChange('<start>')
 
@@ -185,7 +193,7 @@ class Watch {
 
     this.canons.push(canon)
 
-    this.fsw.add(path)
+    this.ensureFSW().add(path)
   }
 
 
@@ -287,7 +295,9 @@ class Watch {
 
 
   async stop() {
-    await this.fsw.close()
+    if (this.fsw) {
+      await this.fsw.close()
+    }
   }