diff --git a/libexec/rbenv-version-file b/libexec/rbenv-version-file
index 7a2b9c6e..5e38c695 100755
--- a/libexec/rbenv-version-file
+++ b/libexec/rbenv-version-file
@@ -6,6 +6,7 @@ set -e
 find_local_version_file() {
   local root="$1"
   while true; do
+    [[ "$root" =~ ^//[^/]*$ ]] && break
     if [ -e "${root}/.ruby-version" ]; then
       echo "${root}/.ruby-version"
       exit