diff --git a/libexec/pyenv-help b/libexec/pyenv-help
index b4e385a3..0bf90abb 100755
--- a/libexec/pyenv-help
+++ b/libexec/pyenv-help
@@ -27,7 +27,7 @@ command_path() {
 }
 
 extract_initial_comment_block() {
-  LC_CTYPE=C
+  LC_ALL=C
   LANG=C
   sed -ne "
     /^#/ !{