diff --git a/nvm.sh b/nvm.sh
index a0bfa8d..c2056f7 100644
--- a/nvm.sh
+++ b/nvm.sh
@@ -541,6 +541,7 @@ nvm_ls() {
     fi
     VERSIONS="$(command find $NVM_DIRS_TO_SEARCH -maxdepth 1 -type d -name "$PATTERN*" \
       | command sed "s#$(nvm_version_dir iojs)/#"$(nvm_iojs_prefix)"-#" \
+      | command grep -v "$(nvm_version_dir iojs)" \
       | command sed "s#^$NVM_DIR/##" \
       | command grep -v -e '^versions$' \
       | command sed 's#^versions/##' \
diff --git "a/test/fast/Listing versions/Running \"nvm ls io\" should return NA" "b/test/fast/Listing versions/Running \"nvm ls io\" should return NA"
new file mode 100755
index 0000000..ddd1123
--- /dev/null
+++ "b/test/fast/Listing versions/Running \"nvm ls io\" should return NA"	
@@ -0,0 +1,7 @@
+ #!/bin/sh
+
+. ../../../nvm.sh
+
+nvm ls io
+[ "$?" = "3" ]
+