diff --git a/build_ptth_server.bash b/build_ptth_server.bash
index fda23e5..6483fcf 100755
--- a/build_ptth_server.bash
+++ b/build_ptth_server.bash
@@ -10,6 +10,8 @@
 
 set -euo pipefail
 
+export LC_ALL="C"
+
 TEMP_GIBBERISH="ptth_server_build_BIHWLQXQ"
 DEST="$TEMP_GIBBERISH/ptth"
 
@@ -25,5 +27,11 @@ cp target/release/ptth_server "$DEST/ptth_server"
 
 (
 cd "$TEMP_GIBBERISH" || exit
-tar -cf "ptth_server.tar" ptth/
+
+find ptth/ -print0 | \
+sort -z | \
+tar --mtime='1970-01-01' --no-recursion --null -T - -cf - > \
+ptth_server.tar.temp
+
+mv ptth_server.tar.temp ptth_server.tar
 )