diff --git a/service/src/main/kotlin/org/microg/nlp/service/GeocodeFuser.kt b/service/src/main/kotlin/org/microg/nlp/service/GeocodeFuser.kt
index 14f25f4..0568ade 100644
--- a/service/src/main/kotlin/org/microg/nlp/service/GeocodeFuser.kt
+++ b/service/src/main/kotlin/org/microg/nlp/service/GeocodeFuser.kt
@@ -11,9 +11,10 @@ import android.location.Address
 import kotlinx.coroutines.launch
 import org.microg.nlp.api.Constants.ACTION_GEOCODER_BACKEND
 import java.util.ArrayList
+import java.util.concurrent.CopyOnWriteArrayList
 
 class GeocodeFuser(private val context: Context, private val root: UnifiedLocationServiceRoot) {
-    private val backendHelpers = ArrayList<GeocodeBackendHelper>()
+    private val backendHelpers = CopyOnWriteArrayList<GeocodeBackendHelper>()
 
     suspend fun reset() {
         unbind()
diff --git a/service/src/main/kotlin/org/microg/nlp/service/LocationFuser.kt b/service/src/main/kotlin/org/microg/nlp/service/LocationFuser.kt
index 84b42be..b5add73 100644
--- a/service/src/main/kotlin/org/microg/nlp/service/LocationFuser.kt
+++ b/service/src/main/kotlin/org/microg/nlp/service/LocationFuser.kt
@@ -19,10 +19,11 @@ import java.util.Comparator
 
 import org.microg.nlp.api.Constants.ACTION_LOCATION_BACKEND
 import org.microg.nlp.api.Constants.LOCATION_EXTRA_OTHER_BACKENDS
+import java.util.concurrent.CopyOnWriteArrayList
 
 class LocationFuser(private val context: Context, private val root: UnifiedLocationServiceRoot) {
 
-    private val backendHelpers = ArrayList<LocationBackendHelper>()
+    private val backendHelpers = CopyOnWriteArrayList<LocationBackendHelper>()
     private var fusing = false
     private var lastLocationReportTime: Long = 0