diff --git a/application/src/main/java/org/opentripplanner/service/vehicleparking/VehicleParkingRepository.java b/application/src/main/java/org/opentripplanner/service/vehicleparking/VehicleParkingRepository.java
index ae4094d904e..7d9e4f110ce 100644
--- a/application/src/main/java/org/opentripplanner/service/vehicleparking/VehicleParkingRepository.java
+++ b/application/src/main/java/org/opentripplanner/service/vehicleparking/VehicleParkingRepository.java
@@ -1,6 +1,6 @@
 package org.opentripplanner.service.vehicleparking;
 
-import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ListMultimap;
 import java.util.Collection;
 import org.opentripplanner.service.vehicleparking.model.VehicleParking;
 import org.opentripplanner.service.vehicleparking.model.VehicleParkingGroup;
@@ -15,5 +15,5 @@ void updateVehicleParking(
   );
   Collection<VehicleParking> listVehicleParkings();
 
-  ImmutableListMultimap<VehicleParkingGroup, VehicleParking> getVehicleParkingGroups();
+  ListMultimap<VehicleParkingGroup, VehicleParking> getVehicleParkingGroups();
 }
diff --git a/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingRepository.java b/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingRepository.java
index e0714e74ee8..ef8f9db99bf 100644
--- a/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingRepository.java
+++ b/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingRepository.java
@@ -2,6 +2,7 @@
 
 import com.google.common.collect.ArrayListMultimap;
 import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ListMultimap;
 import com.google.common.collect.Multimap;
 import jakarta.inject.Inject;
 import jakarta.inject.Singleton;
@@ -71,7 +72,7 @@ public Collection<VehicleParking> listVehicleParkings() {
   }
 
   @Override
-  public ImmutableListMultimap<VehicleParkingGroup, VehicleParking> getVehicleParkingGroups() {
+  public ListMultimap<VehicleParkingGroup, VehicleParking> getVehicleParkingGroups() {
     return vehicleParkingGroups;
   }
 }
diff --git a/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingService.java b/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingService.java
index ef6be50a253..b874c4338b7 100644
--- a/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingService.java
+++ b/application/src/main/java/org/opentripplanner/service/vehicleparking/internal/DefaultVehicleParkingService.java
@@ -1,6 +1,6 @@
 package org.opentripplanner.service.vehicleparking.internal;
 
-import com.google.common.collect.ImmutableListMultimap;
+import com.google.common.collect.ListMultimap;
 import jakarta.inject.Inject;
 import jakarta.inject.Singleton;
 import java.io.Serializable;