diff --git a/pom.xml b/pom.xml
index 9bd414a641..2f182d96f5 100644
--- a/pom.xml
+++ b/pom.xml
@@ -61,6 +61,13 @@
                     <Specification-Title>Bukkit</Specification-Title>
                     <Specification-Version>${api.version}</Specification-Version>
                     <Specification-Vendor>Bukkit Team</Specification-Vendor>
+                    <Sealed>true</Sealed>
+                    <Name>org/bukkit/</Name>
+                    <Sealed>true</Sealed>
+                    <Name>com/bukkit/</Name>
+                    <Sealed>true</Sealed>
+                    <Name>net/bukkit/</Name>
+                    <Sealed>true</Sealed>
                   </manifestEntries>
                 </transformer>
               </transformers>