diff --git a/core/camel-core/src/test/java/org/apache/camel/component/file/FileConsumerThreadsInProgressIssueTest.java b/core/camel-core/src/test/java/org/apache/camel/component/file/FileConsumerThreadsInProgressIssueTest.java
index 0366d265ba812..b8b25a1e7c9f9 100644
--- a/core/camel-core/src/test/java/org/apache/camel/component/file/FileConsumerThreadsInProgressIssueTest.java
+++ b/core/camel-core/src/test/java/org/apache/camel/component/file/FileConsumerThreadsInProgressIssueTest.java
@@ -85,8 +85,9 @@ public void testFileConsumerThreadsInProgressIssue() throws Exception {
     private void createManyFiles(int number) throws Exception {
         Path dir = testDirectory();
         for (int i = 0; i < number; i++) {
+            String fileNamesSuffix = String.format("%04d", i);
             String pad = String.format("%04d%n", i);
-            try (Writer writer = Files.newBufferedWriter(dir.resolve("newFile-" + pad))) {
+            try (Writer writer = Files.newBufferedWriter(dir.resolve("newFile-" + fileNamesSuffix))) {
                 writer.write(pad);
             }
         }