diff --git a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
index 97443079b1b48..289bb95941a63 100644
--- a/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
+++ b/hadoop-tools/hadoop-azure/src/main/java/org/apache/hadoop/fs/azurebfs/constants/FileSystemConfigurations.java
@@ -44,7 +44,7 @@ public final class FileSystemConfigurations {
   public static final int DEFAULT_READ_BUFFER_SIZE = 4 * ONE_MB;  // 4 MB
   public static final int MIN_BUFFER_SIZE = 16 * ONE_KB;  // 16 KB
   public static final int MAX_BUFFER_SIZE = 100 * ONE_MB;  // 100 MB
-  public static final long MAX_AZURE_BLOCK_SIZE = 512 * 1024 * 1024L;
+  public static final long MAX_AZURE_BLOCK_SIZE = 256 * 1024 * 1024L; // changing default blocksize to 256 MB
   public static final String AZURE_BLOCK_LOCATION_HOST_DEFAULT = "localhost";
 
   public static final int MAX_CONCURRENT_READ_THREADS = 12;
@@ -68,4 +68,4 @@ public final class FileSystemConfigurations {
   public static final boolean DEFAULT_USE_UPN = false;
 
   private FileSystemConfigurations() {}
-}
\ No newline at end of file
+}