diff --git a/checkstyle.xml b/checkstyle.xml
index 941543a8..8b8ce8d0 100644
--- a/checkstyle.xml
+++ b/checkstyle.xml
@@ -126,6 +126,7 @@
 
     </module>
     <module name="LineLength">
+        <property name="fileExtensions" value="java"/>
         <property name="max" value="120"/>
     </module>
-</module>
\ No newline at end of file
+</module>