diff --git a/lib/install/validate-tree.js b/lib/install/validate-tree.js
index 5ac979a46c403..d1b40c24c1bcb 100644
--- a/lib/install/validate-tree.js
+++ b/lib/install/validate-tree.js
@@ -39,8 +39,9 @@ function checkErrors (mod, idealTree, next) {
 
 function checkWarnings (mod, idealTree, next) {
   const warnings = mod.package.warnings
-  if (warnings && (mod.parent || path.resolve(npm.globalDir, '..'))) {
+  if (warnings && (mod.parent || path.resolve(npm.globalDir, '..') !== mod.path)) {
     warnings.forEach(warn => idealTree.warnings.push(warn))
+    delete mod.package.warnings
   }
   next()
 }