diff --git a/lib/internal/test_runner/test.js b/lib/internal/test_runner/test.js
index 27ce298d456..5c33d760dd0 100644
--- a/lib/internal/test_runner/test.js
+++ b/lib/internal/test_runner/test.js
@@ -619,8 +619,8 @@ class Test extends AsyncResource {
   }
 
   #duration() {
-    // Duration is recorded in BigInt nanoseconds. Convert to seconds.
-    return Number(this.endTime - this.startTime) / 1_000_000_000;
+    // Duration is recorded in BigInt nanoseconds. Convert to milliseconds.
+    return Number(this.endTime - this.startTime) / 1_000_000;
   }
 
   report() {