diff --git a/libexec/rbenv-version-name b/libexec/rbenv-version-name
index 46e3ae7c..3eef70a8 100755
--- a/libexec/rbenv-version-name
+++ b/libexec/rbenv-version-name
@@ -21,8 +21,8 @@ version_exists() {
 if version_exists "$RBENV_VERSION"; then
   echo "$RBENV_VERSION"
 elif version_exists "${RBENV_VERSION#ruby-}"; then
-  {  echo "rbenv: ignoring extraneous \`ruby-' prefix in version \`${RBENV_VERSION}'"
-     echo "(set by $(rbenv-version-origin))"
+  { echo "warning: ignoring extraneous \`ruby-' prefix in version \`${RBENV_VERSION}'"
+    echo "         (set by $(rbenv-version-origin))"
   } >&2
   echo "${RBENV_VERSION#ruby-}"
 else