diff --git a/pkgs/applications/networking/browsers/chromium/common.nix b/pkgs/applications/networking/browsers/chromium/common.nix
index bc0d9a5c2b0..de0dd9843ff 100644
--- a/pkgs/applications/networking/browsers/chromium/common.nix
+++ b/pkgs/applications/networking/browsers/chromium/common.nix
@@ -133,6 +133,7 @@ let
       ./patches/nix_plugin_paths_68.patch
       ./patches/remove-webp-include-69.patch
       ./patches/jumbo-sorted.patch
+      ./patches/no-build-timestamps.patch
 
       # Unfortunately, chromium regularly breaks on major updates and
       # then needs various patches backported in order to be compiled with GCC.
diff --git a/pkgs/applications/networking/browsers/chromium/patches/no-build-timestamps.patch b/pkgs/applications/networking/browsers/chromium/patches/no-build-timestamps.patch
new file mode 100644
index 00000000000..3234b7279f7
--- /dev/null
+++ b/pkgs/applications/networking/browsers/chromium/patches/no-build-timestamps.patch
@@ -0,0 +1,15 @@
+--- chromium-70.0.3538.67/build/compute_build_timestamp.py.orig	2018-11-02 16:00:34.368933077 +0200
++++ chromium-70.0.3538.67/build/compute_build_timestamp.py	2018-11-03 18:35:20.542943107 +0200
+@@ -94,6 +94,12 @@
+       'build_type', help='The type of build', choices=('official', 'default'))
+   args = argument_parser.parse_args()
+ 
++  # I don't trust LASTCHANGE magic, and I definelly want something deterministic here
++  SOURCE_DATE_EPOCH = os.getenv("SOURCE_DATE_EPOCH", None)
++  if SOURCE_DATE_EPOCH is not None:
++      print SOURCE_DATE_EPOCH
++      return 0
++
+   # The mtime of the revision in build/util/LASTCHANGE is stored in a file
+   # next to it. Read it, to get a deterministic time close to "now".
+   # That date is then modified as described at the top of the file so that