diff --git a/processing/src/main/java/org/apache/druid/segment/writeout/WriteOutBytes.java b/processing/src/main/java/org/apache/druid/segment/writeout/WriteOutBytes.java
index f6a5e71ce93..e1c2972b148 100644
--- a/processing/src/main/java/org/apache/druid/segment/writeout/WriteOutBytes.java
+++ b/processing/src/main/java/org/apache/druid/segment/writeout/WriteOutBytes.java
@@ -45,7 +45,7 @@ public abstract class WriteOutBytes extends OutputStream implements WritableByte
   /**
    * Returns the number of bytes written to this WriteOutBytes so far.
    */
-  public abstract long size() throws IOException;
+  public abstract long size();
 
   /**
    * Takes all bytes that are written to this WriteOutBytes so far and writes them into the given channel.