diff --git a/packages/opentelemetry-resources/test/util/resource-assertions.ts b/packages/opentelemetry-resources/test/util/resource-assertions.ts
index 56b13717352..554c1d3da79 100644
--- a/packages/opentelemetry-resources/test/util/resource-assertions.ts
+++ b/packages/opentelemetry-resources/test/util/resource-assertions.ts
@@ -14,7 +14,6 @@
  * limitations under the License.
  */
 
-import * as assert from 'assert';
 import { Resource } from '../../src/Resource';
 import {
   CLOUD_RESOURCE,
@@ -248,7 +247,7 @@ const assertHasOneLabel = (
   resource: Resource
 ): void => {
   const hasOne = Object.values(constants).reduce(
-    (found, key) => found || resource.labels[key],
+    (found, key) => found || resource.labels.hasOwnProperty(key),
     false
   );
   assert.ok(