diff --git a/libexec/pyenv-help b/libexec/pyenv-help
index 0bf90abb..c7ff6124 100755
--- a/libexec/pyenv-help
+++ b/libexec/pyenv-help
@@ -27,8 +27,8 @@ command_path() {
 }
 
 extract_initial_comment_block() {
-  LC_ALL=C
-  LANG=C
+  LC_ALL= \
+  LC_CTYPE=C \
   sed -ne "
     /^#/ !{
       q