diff --git a/README.md b/README.md
index b9b3c75..1475469 100644
--- a/README.md
+++ b/README.md
@@ -83,7 +83,7 @@ Rule|Level|Source|Enabled|Suppressible
[AtclauseOrder](#atclauseorder)|javadoc|checkstyle|Yes|
[AvoidConditionInversion](#avoidconditioninversion)|complexity|sevntu||
[AvoidConstantAsFirstOperandInCondition](#avoidconstantasfirstoperandincondition)|tweaks|sevntu|Yes|
-[AvoidDefaultSerializableInInnerClasses](#avoiddefaultserializableininnerclasses)|complexity|sevntu||
+[AvoidDefaultSerializableInInnerClasses](#avoiddefaultserializableininnerclasses)|tweaks|sevntu|Yes|
[AvoidEscapedUnicodeCharacters](#avoidescapedunicodecharacters)|tweaks|checkstyle|Yes|
[AvoidHidingCauseException](#avoidhidingcauseexception)|tweaks|sevntu|Yes|
[AvoidInlineConditionals](#avoidinlineconditionals)|complexity|checkstyle|Yes|
@@ -2182,6 +2182,9 @@ Invalid:
````
if (12 == a) {}
````
+#### [AvoidDefaultSerializableInInnerClasses](http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/AvoidDefaultSerializableInInnerClassesCheck.html)
+
+Prevent the use of default serialization methods on inner classes. If an inner class needs to implement the Serializable interface, then it *must* implement both `writeObject()` and `readObject()` methods.
#### [AvoidHidingCauseException](http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/AvoidHidingCauseExceptionCheck.html)
Ensures that an exception is re-thrown properly and is not swallowed by a `catch` block.
@@ -2758,9 +2761,6 @@ As the sevntu check are considered experimental not all those that are not enabl
#### [AvoidConditionInversion](http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/design/AvoidConditionInversionCheck.html)
Should already be covered by [SimplifyBooleanExpression](simplifybooleanexpression).
-#### [AvoidDefaultSerializableInInnerClasses](http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/AvoidDefaultSerializableInInnerClassesCheck.html)
-
-TODO: enable
#### [AvoidModifiersForTypes](http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/AvoidModifiersForTypesCheck.html)
Generic rule; doesn't embody a 'quality' check.
diff --git a/builder/src/main/resources/application.yml b/builder/src/main/resources/application.yml
index c77c447..b6f3195 100644
--- a/builder/src/main/resources/application.yml
+++ b/builder/src/main/resources/application.yml
@@ -1392,11 +1392,10 @@ rules:
-
name: AvoidDefaultSerializableInInnerClasses
parent: TREEWALKER
- level: COMPLEXITY
- enabled: false
+ level: TWEAKS
+ enabled: true
source: SEVNTU
uri: http://sevntu-checkstyle.github.io/sevntu.checkstyle/apidocs/com/github/sevntu/checkstyle/checks/coding/AvoidDefaultSerializableInInnerClassesCheck.html
- reason: "TODO: enable"
-
name: AvoidModifiersForTypes
parent: TREEWALKER
diff --git a/builder/src/main/resources/rules/AvoidDefaultSerializableInInnerClasses.md b/builder/src/main/resources/rules/AvoidDefaultSerializableInInnerClasses.md
new file mode 100644
index 0000000..db09462
--- /dev/null
+++ b/builder/src/main/resources/rules/AvoidDefaultSerializableInInnerClasses.md
@@ -0,0 +1,2 @@
+
+Prevent the use of default serialization methods on inner classes. If an inner class needs to implement the Serializable interface, then it *must* implement both `writeObject()` and `readObject()` methods.
diff --git a/regressions/src/main/java/net/kemitix/checkstyle/regressions/AvoidDefaultSerializableInInnerClasses.java b/regressions/src/main/java/net/kemitix/checkstyle/regressions/AvoidDefaultSerializableInInnerClasses.java
new file mode 100644
index 0000000..1ac2c72
--- /dev/null
+++ b/regressions/src/main/java/net/kemitix/checkstyle/regressions/AvoidDefaultSerializableInInnerClasses.java
@@ -0,0 +1,41 @@
+/**
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2017 Paul Campbell
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy of this software
+ * and associated documentation files (the "Software"), to deal in the Software without restriction,
+ * including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so,
+ * subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all copies
+ * or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+ * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE
+ * AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+package net.kemitix.checkstyle.regressions;
+
+import java.io.Serializable;
+
+/**
+ * Regression test for {@code AvoidDefaultSerializableInInnerClasses}.
+ *
+ * @author Paul Campbell (pcampbell@kemitix.net)
+ */
+public class AvoidDefaultSerializableInInnerClasses {
+
+ /**
+ * Inner class should not use default implementations of {@code readObject()} and {@code writeObject()}.
+ */
+ @SuppressWarnings("avoiddefaultserializableininnerclasses")
+ public class InnerClass implements Serializable {
+
+ }
+
+}
diff --git a/ruleset/src/main/resources/net/kemitix/checkstyle-4-tweaks.xml b/ruleset/src/main/resources/net/kemitix/checkstyle-4-tweaks.xml
index 33bebda..0358887 100644
--- a/ruleset/src/main/resources/net/kemitix/checkstyle-4-tweaks.xml
+++ b/ruleset/src/main/resources/net/kemitix/checkstyle-4-tweaks.xml
@@ -177,6 +177,7 @@
+
diff --git a/ruleset/src/main/resources/net/kemitix/checkstyle-5-complexity.xml b/ruleset/src/main/resources/net/kemitix/checkstyle-5-complexity.xml
index dcbdc0a..e3a5f44 100644
--- a/ruleset/src/main/resources/net/kemitix/checkstyle-5-complexity.xml
+++ b/ruleset/src/main/resources/net/kemitix/checkstyle-5-complexity.xml
@@ -230,6 +230,7 @@
+