diff --git a/rust/proc_macro.go b/rust/proc_macro.go
index 28ed68b..837e1a6 100644
--- a/rust/proc_macro.go
+++ b/rust/proc_macro.go
@@ -100,3 +100,9 @@
 	// Proc_macros are never installed
 	return false
 }
+
+func (library *procMacroDecorator) moduleInfoJSON(ctx ModuleContext, moduleInfoJSON *android.ModuleInfoJSON) {
+	library.baseCompiler.moduleInfoJSON(ctx, moduleInfoJSON)
+
+	moduleInfoJSON.Class = []string{"PROC_MACRO_LIBRARIES"}
+}