diff --git a/nvm.sh b/nvm.sh
index 88d391f..f4769de 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -3145,7 +3145,7 @@ nvm() {
           unset ALIAS
         fi
 
-        nvm_list_aliases "${ALIAS}"
+        nvm_list_aliases "${ALIAS-}"
       fi
     ;;
     "unalias" )