diff --git a/enabler/src/de/schildbach/pte/dto/Fare.java b/enabler/src/de/schildbach/pte/dto/Fare.java
index 5ee309e0..42613348 100644
--- a/enabler/src/de/schildbach/pte/dto/Fare.java
+++ b/enabler/src/de/schildbach/pte/dto/Fare.java
@@ -30,7 +30,6 @@ import com.google.common.base.Objects;
 /**
  * @author Andreas Schildbach
  */
-@SuppressWarnings("serial")
 public final class Fare implements Serializable
 {
 	public enum Type
@@ -38,6 +37,8 @@ public final class Fare implements Serializable
 		ADULT, CHILD, YOUTH, STUDENT, MILITARY, SENIOR, DISABLED
 	}
 
+	private static final long serialVersionUID = -6136489996930976421L;
+
 	public final String network;
 	public final Type type;
 	public final Currency currency;
diff --git a/enabler/src/de/schildbach/pte/dto/Location.java b/enabler/src/de/schildbach/pte/dto/Location.java
index e104a360..59aaea25 100644
--- a/enabler/src/de/schildbach/pte/dto/Location.java
+++ b/enabler/src/de/schildbach/pte/dto/Location.java
@@ -33,9 +33,10 @@ import com.google.common.base.Strings;
 /**
  * @author Andreas Schildbach
  */
-@SuppressWarnings("serial")
 public final class Location implements Serializable
 {
+	private static final long serialVersionUID = -2124775933106309127L;
+
 	public final LocationType type;
 	public final @Nullable String id;
 	public final int lat, lon;
diff --git a/enabler/src/de/schildbach/pte/dto/Point.java b/enabler/src/de/schildbach/pte/dto/Point.java
index c1adb2f7..ff47474e 100644
--- a/enabler/src/de/schildbach/pte/dto/Point.java
+++ b/enabler/src/de/schildbach/pte/dto/Point.java
@@ -24,9 +24,10 @@ import com.google.common.base.Objects;
 /**
  * @author Andreas Schildbach
  */
-@SuppressWarnings("serial")
 public final class Point implements Serializable
 {
+	private static final long serialVersionUID = -256077054671402897L;
+
 	public final int lat, lon;
 
 	public Point(final int lat, final int lon)
diff --git a/enabler/src/de/schildbach/pte/dto/Position.java b/enabler/src/de/schildbach/pte/dto/Position.java
index c8d196f0..3bf0615f 100644
--- a/enabler/src/de/schildbach/pte/dto/Position.java
+++ b/enabler/src/de/schildbach/pte/dto/Position.java
@@ -29,9 +29,10 @@ import com.google.common.base.Objects;
 /**
  * @author Andreas Schildbach
  */
-@SuppressWarnings("serial")
 public final class Position implements Serializable
 {
+	private static final long serialVersionUID = 5800904192562764917L;
+
 	public final String name;
 	public final @Nullable String section;
 
diff --git a/enabler/src/de/schildbach/pte/dto/Stop.java b/enabler/src/de/schildbach/pte/dto/Stop.java
index 56f18242..5417faad 100644
--- a/enabler/src/de/schildbach/pte/dto/Stop.java
+++ b/enabler/src/de/schildbach/pte/dto/Stop.java
@@ -32,9 +32,10 @@ import com.google.common.base.Objects;
 /**
  * @author Andreas Schildbach
  */
-@SuppressWarnings("serial")
 public final class Stop implements Serializable
 {
+	private static final long serialVersionUID = 5034616799626145715L;
+
 	public final Location location;
 	public final @Nullable Date plannedArrivalTime;
 	public final @Nullable Date predictedArrivalTime;