diff --git a/java/src/main/java/kanzi/app/BlockCompressor.java b/java/src/main/java/kanzi/app/BlockCompressor.java
index 9cca5216..a1254701 100644
--- a/java/src/main/java/kanzi/app/BlockCompressor.java
+++ b/java/src/main/java/kanzi/app/BlockCompressor.java
@@ -259,7 +259,6 @@ public Integer call()
          ctx.put("pool", this.pool);
          ctx.put("codec", this.codec);
          ctx.put("transform", this.transform);
-         ctx.put("extra", "TPAQX".equals(this.codec));
                
          // Run the task(s)
          if (nbFiles == 1)
@@ -281,6 +280,7 @@ else if ((inputIsDir == true) && (specialOutput == false))
             ctx.put("inputName", iName);
             ctx.put("outputName", oName);
             ctx.put("jobs", this.jobs);
+            ctx.put("extra", "TPAQX".equals(this.codec));
             FileCompressTask task = new FileCompressTask(ctx, this.listeners);
             FileCompressResult fcr = task.call();
             res = fcr.code;