diff --git a/README.md b/README.md
index 3b421bc..41f3796 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,7 @@
-clipmenu is a simple clipboard manager using [dmenu][] (or [rofi][]) and
-[xsel][].
+[![Tests](https://img.shields.io/travis/cdown/clipmenu/develop.svg)](https://travis-ci.org/cdown/clipmenu)
+
+clipmenu is a simple clipboard manager using [dmenu][] (or [rofi][] with
+`CM_LAUNCHER=rofi`) and [xsel][].
 
 # Demo
 
diff --git a/clipmenu b/clipmenu
index b5a4abf..3d245a4 100755
--- a/clipmenu
+++ b/clipmenu
@@ -35,8 +35,8 @@ fi
 # argument to override an earlier one. That is, if the user passes in `-l`, our
 # one will be ignored.
 chosen_line=$(
-    cat "$cache_file_prefix"_* /dev/null | sort -rnk 1 | cut -d' ' -f2- |
-        awk '!seen[$0]++' | "$CM_LAUNCHER" -l 8 "$@"
+    cat "$cache_file_prefix"_* /dev/null | LC_ALL=C sort -rnk 1 |
+        cut -d' ' -f2- | awk '!seen[$0]++' | "$CM_LAUNCHER" -l 8 "$@"
 )
 
 [[ $chosen_line ]] || exit 1
diff --git a/clipmenud b/clipmenud
index cc5adcc..6b83508 100755
--- a/clipmenud
+++ b/clipmenud
@@ -190,7 +190,7 @@ while true; do
 
         # Without checking ${last_data[any]}, we often double write since both
         # selections get the same content
-        cache_file_output="$(date +%s) $first_line"
+        cache_file_output="$(date +%s%N) $first_line"
         if [[ ${last_data[any]} != "$data" ]]; then
             filename="$cache_dir/$(cksum <<< "$first_line")"
             debug "Writing $data to $filename"