diff --git a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractMongoConfiguration.java b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractMongoConfiguration.java
index 79b7b40f3..d9c52e3bb 100644
--- a/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractMongoConfiguration.java
+++ b/spring-data-mongodb/src/main/java/org/springframework/data/mongodb/config/AbstractMongoConfiguration.java
@@ -116,7 +116,9 @@ public abstract class AbstractMongoConfiguration {
 	 *         entities.
 	 */
 	protected String getMappingBasePackage() {
-		return getClass().getPackage().getName();
+
+		Package mappingBasePackage = getClass().getPackage();
+		return mappingBasePackage == null ? null : mappingBasePackage.getName();
 	}
 
 	/**
diff --git a/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackage.java b/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackage.java
new file mode 100644
index 000000000..4a77bc00e
--- /dev/null
+++ b/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackage.java
@@ -0,0 +1,48 @@
+/*
+ * Copyright 2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import org.springframework.context.annotation.Configuration;
+import org.springframework.data.mongodb.config.AbstractMongoConfiguration;
+
+import com.mongodb.Mongo;
+import com.mongodb.MongoClient;
+
+/**
+ * Sample configuration class in default package.
+ * 
+ * @see DATAMONGO-877
+ * @author Oliver Gierke
+ */
+@Configuration
+public class ConfigClassInDefaultPackage extends AbstractMongoConfiguration {
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.mongodb.config.AbstractMongoConfiguration#getDatabaseName()
+	 */
+	@Override
+	protected String getDatabaseName() {
+		return "default";
+	}
+
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.data.mongodb.config.AbstractMongoConfiguration#mongo()
+	 */
+	@Override
+	public Mongo mongo() throws Exception {
+		return new MongoClient();
+	}
+}
diff --git a/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackageUnitTests.java b/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackageUnitTests.java
new file mode 100644
index 000000000..f9b9a78ca
--- /dev/null
+++ b/spring-data-mongodb/src/test/java/ConfigClassInDefaultPackageUnitTests.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2014 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+import org.junit.Test;
+import org.springframework.context.annotation.AnnotationConfigApplicationContext;
+
+/**
+ * Unit test for {@link ConfigClassInDefaultPackage}.
+ * 
+ * @see DATAMONGO-877
+ * @author Oliver Gierke
+ */
+public class ConfigClassInDefaultPackageUnitTests {
+
+	/**
+	 * @see DATAMONGO-877
+	 */
+	@Test
+	public void loadsConfigClassFromDefaultPackage() {
+		new AnnotationConfigApplicationContext(ConfigClassInDefaultPackage.class).close();
+	}
+}