diff --git a/app/src/main/java/se/ajpanton/notificationlog/settings/LoggingRuleStore.kt b/app/src/main/java/se/ajpanton/notificationlog/settings/LoggingRuleStore.kt
index f23841e..e616791 100644
--- a/app/src/main/java/se/ajpanton/notificationlog/settings/LoggingRuleStore.kt
+++ b/app/src/main/java/se/ajpanton/notificationlog/settings/LoggingRuleStore.kt
@@ -27,7 +27,7 @@ class LoggingRuleStore(context: Context) {
     }
 
     fun copy(from: LoggingType, targets: Set<LoggingType>) {
-        val source = ruleFor(from)
+        val source = ruleFor(from).copyForTarget()
         preferences.edit {
             targets.filterNot { it == from }.forEach { target ->
                 write(target, source.copy(selectedPackages = source.selectedPackages.toSet()))
@@ -50,3 +50,5 @@ class LoggingRuleStore(context: Context) {
         const val FILE_NAME = "logging-rules"
     }
 }
+
+internal fun LoggingRule.copyForTarget(): LoggingRule = copy(selectedPackages = selectedPackages.toSet())
diff --git a/app/src/test/java/se/ajpanton/notificationlog/settings/LoggingRuleCopyTest.kt b/app/src/test/java/se/ajpanton/notificationlog/settings/LoggingRuleCopyTest.kt
new file mode 100644
index 0000000..b27d6d7
--- /dev/null
+++ b/app/src/test/java/se/ajpanton/notificationlog/settings/LoggingRuleCopyTest.kt
@@ -0,0 +1,15 @@
+package se.ajpanton.notificationlog.settings
+
+import org.junit.Assert.assertEquals
+import org.junit.Assert.assertNotSame
+import org.junit.Test
+
+class LoggingRuleCopyTest {
+    @Test fun `copy retains every rule field and owns its selected-package set`() {
+        val source = LoggingRule(false, AppRuleMode.WHITELIST, setOf("example.app"), true, false, false)
+        val target = source.copyForTarget()
+
+        assertEquals(source, target)
+        assertNotSame(source.selectedPackages, target.selectedPackages)
+    }
+}