diff --git a/sdks/java/core/src/test/java/org/apache/beam/sdk/io/CompressedSourceTest.java b/sdks/java/core/src/test/java/org/apache/beam/sdk/io/CompressedSourceTest.java
index 9b44386b9805..c34d2ddffa2e 100644
--- a/sdks/java/core/src/test/java/org/apache/beam/sdk/io/CompressedSourceTest.java
+++ b/sdks/java/core/src/test/java/org/apache/beam/sdk/io/CompressedSourceTest.java
@@ -384,9 +384,7 @@ private byte[] generateInput(int size) {
     // Arbitrary but fixed seed
     Random random = new Random(285930);
     byte[] buff = new byte[size];
-    for (int i = 0; i < size; i++) {
-      buff[i] = (byte) (random.nextInt() % Byte.MAX_VALUE);
-    }
+    random.nextBytes(buff);
     return buff;
   }