diff --git a/bloomfilter/bloomfilter-tests.ts b/bloomfilter/bloomfilter-tests.ts
index 6bce779d63..f1f3306d62 100644
--- a/bloomfilter/bloomfilter-tests.ts
+++ b/bloomfilter/bloomfilter-tests.ts
@@ -6,6 +6,6 @@ function test_bloomfilter() {
     let bloomFilter = new BloomFilter(m, k);
     let array: Array<Int32Array> = bloomFilter.buckets;
     let length: number = bloomFilter.buckets.length;
-    let add: void = bloomFilter.add('someString');
+    bloomFilter.add('someString');
     let test: boolean = bloomFilter.test('someString');
 }