diff --git a/plugins/npm/npm.plugin.zsh b/plugins/npm/npm.plugin.zsh
index d19079b3f..07f241544 100644
--- a/plugins/npm/npm.plugin.zsh
+++ b/plugins/npm/npm.plugin.zsh
@@ -4,4 +4,5 @@ eval "$(npm completion 2>/dev/null)"
 alias npms="npm i -S "
 
 # Install and save to dev-dependencies
-alias npmd="npm i -D "
+# Skipped if npmd module installed
+[[ ! -e $(which npmd) ]] && alias npmd="npm i -D "