diff --git a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopDirTreeGenerator.java b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopDirTreeGenerator.java
index b0937d0ba61b..53cc34cc51d6 100644
--- a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopDirTreeGenerator.java
+++ b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopDirTreeGenerator.java
@@ -70,7 +70,7 @@ public class HadoopDirTreeGenerator extends BaseFreonGenerator
           "written in each directory. Full name --fileSize will be removed " +
           "in later versions.",
       defaultValue = "4096")
-  private int fileSizeInBytes;
+  private long fileSizeInBytes;
 
   @Option(names = {"-b", "--buffer"},
           description = "Size of buffer used to generated the file content.",
diff --git a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopFsGenerator.java b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopFsGenerator.java
index 1f0c3e92ab84..755c57ac92f3 100644
--- a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopFsGenerator.java
+++ b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/HadoopFsGenerator.java
@@ -51,7 +51,7 @@ public class HadoopFsGenerator extends BaseFreonGenerator
   @Option(names = {"-s", "--size"},
       description = "Size of the generated files (in bytes)",
       defaultValue = "10240")
-  private int fileSize;
+  private long fileSize;
 
   @Option(names = {"--buffer"},
       description = "Size of buffer used store the generated key content",
diff --git a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/StreamingGenerator.java b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/StreamingGenerator.java
index 670a975d36ea..35580fdefab3 100644
--- a/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/StreamingGenerator.java
+++ b/hadoop-ozone/tools/src/main/java/org/apache/hadoop/ozone/freon/StreamingGenerator.java
@@ -63,7 +63,7 @@ public class StreamingGenerator extends BaseFreonGenerator
   @CommandLine.Option(names = {"--size"},
       description = "Size of the generated files.",
       defaultValue = "104857600")
-  private int fileSize;
+  private long fileSize;
 
   private static final String SUB_DIR_NAME = "dir1";