diff --git a/styleguide/checkstyle.xml b/styleguide/checkstyle.xml
index 7bc388e..758cee4 100644
--- a/styleguide/checkstyle.xml
+++ b/styleguide/checkstyle.xml
@@ -51,6 +51,26 @@
       <property name="message"
                 value="Avoid using corresponding octal or Unicode escape." />
     </module>
+    <module name="IllegalTokenText">
+      <property name="tokens"
+                value="NUM_INT,NUM_LONG"/>
+      <property name="format"
+                value="^0[^lx]"/>
+      <property name="ignoreCase"
+                value="true"/>
+      <property name="message"
+                value="Forbid leading zeros in an integer literal, other than zero and a hex literal." />
+    </module>
+    <module name="IllegalTokenText">
+      <property name="tokens"
+                value="NUM_DOUBLE,NUM_FLOAT"/>
+      <property name="format"
+                value="(^\.|\.$)"/>
+      <property name="ignoreCase"
+                value="true"/>
+      <property name="message"
+                value="Must use leading and trailing zero in floating point numbers." />
+    </module>
     <module name="AvoidEscapedUnicodeCharacters">
       <property name="allowEscapesForControlCharacters"
                 value="true" />