diff --git a/meta/classes/multiarch.bbclass b/meta/classes/multiarch.bbclass
index b3fc9441..d1bad652 100644
--- a/meta/classes/multiarch.bbclass
+++ b/meta/classes/multiarch.bbclass
@@ -52,6 +52,8 @@ python multiarch_virtclass_handler() {
             if v is not None and '${PN}' in v:
                 d.setVar(var + ':remove', v)
                 d.appendVar(var, v.replace('${PN}', '${BPN}'))
+                bb.warn('Variable PN in ' + var + ' is not recommended. ' +
+                        'Use BPN instead.')
 
     # When building compat/native, the corresponding suffix needs to be
     # propagated to all bitbake dependency definitions.