diff --git a/common-npm-packages/codecoverage-tools/jacoco/jacoco.ant.ccenabler.ts b/common-npm-packages/codecoverage-tools/jacoco/jacoco.ant.ccenabler.ts
index 9fa303ef..b8319cd6 100644
--- a/common-npm-packages/codecoverage-tools/jacoco/jacoco.ant.ccenabler.ts
+++ b/common-npm-packages/codecoverage-tools/jacoco/jacoco.ant.ccenabler.ts
@@ -66,7 +66,7 @@ export class JacocoAntCodeCoverageEnabler extends cc.JacocoCodeCoverageEnabler {
 
     protected getSourceFilter(): string {
         let srcData = "";
-        let srcDirs = this.sourceDirs === null ? "" : this.sourceDirs;
+        let srcDirs = util.isNullOrWhitespace(this.sourceDirs) ? "" : this.sourceDirs;
         srcDirs.split(",").forEach(dir => {
             if (!util.isNullOrWhitespace(dir)) {
                 srcData += `<fileset dir="${dir}"/>`;