diff --git a/nvm.sh b/nvm.sh
index 7084e4c..2dae812 100755
--- a/nvm.sh
+++ b/nvm.sh
@@ -2239,7 +2239,7 @@ $NVM_LS_REMOTE_POST_MERGED_OUTPUT" | command grep -v "N/A" | command sed '/^$/d'
 }
 
 nvm_supports_source_options() {
-  [ "_$(echo 'echo $1' | . /dev/stdin yes 2> /dev/null)" = "_yes" ]
+  [ "_$(echo '[ $# -gt 0 ] && echo $1' | . /dev/stdin yes 2> /dev/null)" = "_yes" ]
 }
 
 nvm_supports_xz() {