diff --git a/lib/internal/process/write-coverage.js b/lib/internal/process/write-coverage.js
index 6bbc59a6e981be..50c55200d2185f 100644
--- a/lib/internal/process/write-coverage.js
+++ b/lib/internal/process/write-coverage.js
@@ -5,12 +5,10 @@ const fs = require('fs');
 const mkdirSync = fs.mkdirSync;
 const writeFileSync = fs.writeFileSync;
 
-var isWritingCoverage = false;
 function writeCoverage() {
-  if (isWritingCoverage || !global.__coverage__) {
+  if (!global.__coverage__) {
     return;
   }
-  isWritingCoverage = true;
 
   const dirname = path.join(path.dirname(process.execPath), '.coverage');
   const filename = `coverage-${process.pid}-${Date.now()}.json`;