diff --git a/src/main/java/com/inteligr8/rs/Client.java b/src/main/java/com/inteligr8/rs/Client.java
index cda7b3a..1700d99 100644
--- a/src/main/java/com/inteligr8/rs/Client.java
+++ b/src/main/java/com/inteligr8/rs/Client.java
@@ -22,7 +22,6 @@ import com.fasterxml.jackson.databind.ObjectMapper;
 import com.fasterxml.jackson.databind.SerializationFeature;
 import com.fasterxml.jackson.datatype.jsr310.JavaTimeModule;
 import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
-import com.fasterxml.jackson.jaxrs.json.JacksonJsonProvider;
 
 /**
  * A class that provides pre-configured JAX-RS Client & WebTarget objects.
@@ -70,9 +69,14 @@ public abstract class Client {
 	public final javax.ws.rs.client.Client buildClient(AuthorizationFilter authFilter) {
 	    ObjectMapper om = new ObjectMapper();
 	    om.registerModules(new JavaTimeModule());
+	    this.getConfig().configureJacksonMapper(om);
 	    
-		JacksonJsonProvider provider = new JacksonJaxbJsonProvider(om, JacksonJaxbJsonProvider.DEFAULT_ANNOTATIONS);
-
+	    JacksonJaxbJsonProvider provider = new JacksonJaxbJsonProvider(om, JacksonJaxbJsonProvider.DEFAULT_ANNOTATIONS);
+        provider.enable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_AS_NULL);
+	    provider.disable(DeserializationFeature.READ_UNKNOWN_ENUM_VALUES_USING_DEFAULT_VALUE);
+	    
+		this.getConfig().configureJacksonProvider(provider);
+        
 		if (this.getConfig().isWrapRootValueEnabled())
 			provider.enable(SerializationFeature.WRAP_ROOT_VALUE);
 		if (this.getConfig().isUnwrapRootValueEnabled())
@@ -88,15 +92,17 @@ public abstract class Client {
 			clientBuilder.register(authFilter);
 		this.buildClient(clientBuilder);
 		
+		this.getConfig().configureClient(clientBuilder);
+		
 		return clientBuilder.build();
 	}
-	
-	/**
-	 * @param clientBuilder A client builder
-	 */
-	public void buildClient(ClientBuilder clientBuilder) {
-		// for extension purposes
-	}
+    
+    /**
+     * @param clientBuilder A client builder
+     */
+    public void buildClient(ClientBuilder clientBuilder) {
+        // for extension purposes
+    }
 
 	/**
 	 * @return A pre-configured JAX-RS target (client w/ base URL) with configured authorization.
diff --git a/src/main/java/com/inteligr8/rs/ClientConfiguration.java b/src/main/java/com/inteligr8/rs/ClientConfiguration.java
index 1bc48fe..48834b0 100644
--- a/src/main/java/com/inteligr8/rs/ClientConfiguration.java
+++ b/src/main/java/com/inteligr8/rs/ClientConfiguration.java
@@ -16,6 +16,11 @@ package com.inteligr8.rs;
 
 import java.net.URI;
 
+import javax.ws.rs.client.ClientBuilder;
+
+import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.jaxrs.json.JacksonJaxbJsonProvider;
+
 /**
  * This interface defines the configurable parameters of the clients; primarily
  * their default authentication and authorization.
@@ -128,6 +133,18 @@ public interface ClientConfiguration {
 	default boolean isWrapRootValueEnabled() {
 		return false;
 	}
+    
+    /**
+     * @param mapper A Jackson object mapper to configure.
+     */
+    default void configureJacksonMapper(ObjectMapper mapper) {
+    }
+	
+	/**
+	 * @param provider A Jackson JAX-RS provider to configure.
+	 */
+	default void configureJacksonProvider(JacksonJaxbJsonProvider provider) {
+	}
 	
 	
 
@@ -169,5 +186,13 @@ public interface ClientConfiguration {
 			return null;
 		}
 	}
+    
+    /**
+     * A Jackson provider, logging filter, and authentication filter are already registered.
+     * 
+     * @param clientBuilder A JAX-RS client builder to configure.
+     */
+    default void configureClient(ClientBuilder clientBuilder) {
+    }
 
 }