diff --git a/lib/modules/coverage/index.js b/lib/modules/coverage/index.js
index 8dfe6583d..f71c30b81 100644
--- a/lib/modules/coverage/index.js
+++ b/lib/modules/coverage/index.js
@@ -41,9 +41,9 @@ class CodeCoverage {
   }
 
   updateCoverageReport(cb) {
-    fs.mkdirpSync(this.dotEmbarkPath);
-    fs.writeFileSync(this.coverageReportPath, JSON.stringify(this.coverageReport));
-    cb();
+    fs.mkdirp(this.dotEmbarkPath, () => {
+      fs.writeFile(this.coverageReportPath, JSON.stringify(this.coverageReport), cb);
+    });
   }
 
   async runSolc(receipt) {