diff --git a/Makefile.am b/Makefile.am
index 2ce74aa5..1e7ba612 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -5,6 +5,9 @@
 ## You can do whatever you want with this file.
 ##
 
+# Use -n to prevent gzip from adding a timestamp to the .gz headers.
+GZIP_ENV = -9n
+
 DIST_SUBDIRS = lib src po tests debug
 SUBDIRS =