diff --git a/java/bootclasspath.go b/java/bootclasspath.go
index 29eed79..c7dc3af 100644
--- a/java/bootclasspath.go
+++ b/java/bootclasspath.go
@@ -185,6 +185,9 @@
 // The tag used for dependencies onto bootclasspath_fragments.
 var bootclasspathFragmentDepTag = bootclasspathDependencyTag{name: "fragment"}
 
+// The tag used for dependencies onto platform_bootclasspath.
+var platformBootclasspathDepTag = bootclasspathDependencyTag{name: "platform"}
+
 // BootclasspathNestedAPIProperties defines properties related to the API provided by parts of the
 // bootclasspath that are nested within the main BootclasspathAPIProperties.
 type BootclasspathNestedAPIProperties struct {