diff --git a/rust/proc_macro.go b/rust/proc_macro.go
index 4eead32..c217959 100644
--- a/rust/proc_macro.go
+++ b/rust/proc_macro.go
@@ -82,3 +82,8 @@
 func (procMacro *procMacroDecorator) autoDep(ctx android.BottomUpMutatorContext) autoDep {
 	return rlibAutoDep
 }
+
+func (procMacro *procMacroDecorator) everInstallable() bool {
+	// Proc_macros are never installed
+	return false
+}