diff --git a/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java
new file mode 100644
index 0000000..00f4d61
--- /dev/null
+++ b/src/main/java/net/onrc/onos/ofcontroller/util/serializers/FlowEntryIdSerializer.java
@@ -0,0 +1,23 @@
+package net.onrc.onos.ofcontroller.util.serializers;
+
+import java.io.IOException;
+
+import org.codehaus.jackson.JsonGenerator;
+import org.codehaus.jackson.JsonProcessingException;
+import org.codehaus.jackson.map.JsonSerializer;
+import org.codehaus.jackson.map.SerializerProvider;
+
+import net.onrc.onos.ofcontroller.util.FlowEntryId;
+
+/**
+ * Serialize a Flow Entry ID as a hexadecimal string.
+ */
+public class FlowEntryIdSerializer extends JsonSerializer<FlowEntryId> {
+
+    @Override
+    public void serialize(FlowEntryId flowEntryId, JsonGenerator jGen,
+			  SerializerProvider serializer)
+	throws IOException, JsonProcessingException {
+	jGen.writeString(flowEntryId.toString());
+    }
+}