1 files changed, 6 insertions, 1 deletions

diff --git a/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java b/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
index cf5c2c8..ae30667 100644
--- a/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
+++ b/src/main/java/cuchaz/enigma/gui/dialog/ProgressDialog.java
@@ -89,7 +89,12 @@ public class ProgressDialog implements ProgressListener, AutoCloseable {
         @Override
         public void step(int numDone, String message) {
                 this.labelText.setText(message);
-                this.progress.setValue(numDone);
+                if (numDone != -1) {
+                        this.progress.setValue(numDone);
+                        this.progress.setIndeterminate(false);
+                } else {
+                        this.progress.setIndeterminate(true);
+                }
 
                 // update the frame
                 this.frame.validate();