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-rw-r--r--altoslib/AltosListenerState.java4
1 files changed, 3 insertions, 1 deletions
diff --git a/altoslib/AltosListenerState.java b/altoslib/AltosListenerState.java
index 054ff1d0..ed1f0f19 100644
--- a/altoslib/AltosListenerState.java
+++ b/altoslib/AltosListenerState.java
@@ -17,7 +17,9 @@
package org.altusmetrum.altoslib_5;
-public class AltosListenerState {
+import java.io.*;
+
+public class AltosListenerState implements Serializable {
public int crc_errors;
public double battery;