diff --git a/completion/available/nvm.completion.bash b/completion/available/nvm.completion.bash
index 82615139..a82b82b6 100644
--- a/completion/available/nvm.completion.bash
+++ b/completion/available/nvm.completion.bash
@@ -2,9 +2,7 @@
 
 # nvm (Node Version Manager) completion
 
-if [ -r $NVM_DIR/bash_completion ]
+if [ "$NVM_DIR" ] && [ -r "$NVM_DIR"/bash_completion ];
 then
-  . $NVM_DIR/bash_completion
-else
-  echo "Enable nvm plugin first"
+  . "$NVM_DIR"/bash_completion
 fi