diff --git a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/AlarmConfiguration.tjava b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/AlarmConfiguration.tjava
index 17c6dc7..317b51a 100644
--- a/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/AlarmConfiguration.tjava
+++ b/src/main/tjava/com/r35157/jupiterperpsalarm/impl/ref/AlarmConfiguration.tjava
@@ -3,6 +3,7 @@ package com.r35157.jupiterperpsalarm.impl.ref;
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.concurrent.ConcurrentHashMap;
 
 public record AlarmConfiguration(
         List<PriceAlarmDefinition> definitions,
@@ -13,6 +14,6 @@ public record AlarmConfiguration(
         Objects.requireNonNull(variables, "variables");
 
         definitions = List.copyOf(definitions);
-        variables = Map.copyOf(variables);
+        variables = new ConcurrentHashMap<>(variables);
     }
 }
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