diff --git a/src/main/resources/hc-stylecheck/default.xml b/src/main/resources/hc-stylecheck/default.xml
index 07e0031..11b852f 100644
--- a/src/main/resources/hc-stylecheck/default.xml
+++ b/src/main/resources/hc-stylecheck/default.xml
@@ -33,6 +33,7 @@
   </module>
   <module name="Header">
     <property name="headerFile" value="${checkstyle.header.file}" />
+    <property name="fileExtensions" value="java"/>
   </module>
   <module name="FileTabCharacter">
     <property name="eachLine" value="true"/>
diff --git a/src/main/resources/hc-stylecheck/minimal.xml b/src/main/resources/hc-stylecheck/minimal.xml
index a879a0e..146c307 100644
--- a/src/main/resources/hc-stylecheck/minimal.xml
+++ b/src/main/resources/hc-stylecheck/minimal.xml
@@ -31,6 +31,7 @@
   </module>
   <module name="Header">
     <property name="headerFile" value="${checkstyle.header.file}" />
+    <property name="fileExtensions" value="java"/>
   </module>
   <module name="FileTabCharacter">
     <property name="eachLine" value="true"/>