diff --git a/lib/cov_command.js b/lib/cov_command.js
index 1bce3e54..b19afc9e 100644
--- a/lib/cov_command.js
+++ b/lib/cov_command.js
@@ -44,8 +44,10 @@ class CovCommand extends Command {
     yield this.helper.forkNode(covFile, covArgs, opt);
     rimraf.sync(process.env.TMPDIR);
 
-    // wait 1 second for Windows
-    yield sleep(1000);
+    // wait 5 second for Windows
+    if (process.platform === 'win32') {
+      yield sleep(5000);
+    }
 
     // create coverage report
     const reportArgs = this.getReportArgs(coverageDir);