diff --git a/lib/virtual.js b/lib/virtual.js
index 307e2c27..2406a7f6 100644
--- a/lib/virtual.js
+++ b/lib/virtual.js
@@ -34,11 +34,24 @@ function VirtualModulesPlugin(compiler) {
 			this._virtualFiles[file] = { stats: stats, contents: contents };
 			setData(this._statStorage, file, [null, stats]);
 			setData(this._readFileStorage, file, [null, contents]);
+			compiler.fileTimestamps.set(file, +stats.mtime);
 		};
 	}
 
 	const watchRunHook = (watcher, callback) => {
 		this._watcher = watcher.compiler || watcher;
+
+		var virtualFiles = this.compiler.inputFileSystem._virtualFiles;
+
+		if (virtualFiles) {
+			Object.keys(virtualFiles).forEach(
+				function(file) {
+					var mtime = +virtualFiles[file].stats.mtime;
+					compiler.fileTimestamps.set(file, mtime);
+				}
+			);
+		}
+
 		callback();
 	};