diff --git a/lib/internal/test_runner/yaml_parser.js b/lib/internal/test_runner/yaml_parser.js
index 65cc2881328e5d..08fdc4f43e37a0 100644
--- a/lib/internal/test_runner/yaml_parser.js
+++ b/lib/internal/test_runner/yaml_parser.js
@@ -73,7 +73,7 @@ function getYamlValue(value) {
   if (value === 'false') {
     return false;
   }
-  if (value && !NumberIsNaN(Number(value))) {
+  if (value !== '' && !NumberIsNaN(value)) {
     return Number(value);
   }
   return value;