diff --git a/debian/changelog b/debian/changelog
index b9b5e3fa0..bb24e3d62 100644
--- a/debian/changelog
+++ b/debian/changelog
@@ -3,6 +3,7 @@ linux (4.1.1-1~exp2) UNRELEASED; urgency=medium
   * Fix more issues that prevent a reproducible build:
     - linux-doc: DocBook: generate consistent IDs
     - linux-doc: DocBook: Fix duplicate man pages
+    - linux-manual: kernel-doc: Use $KBUILD_BUILD_TIMESTAMP as man page date
 
  -- Ben Hutchings <ben@decadent.org.uk>  Tue, 07 Jul 2015 16:25:05 +0100
 
diff --git a/debian/patches/bugfix/all/kernel-doc-set-man-page-date.patch b/debian/patches/bugfix/all/kernel-doc-set-man-page-date.patch
new file mode 100644
index 000000000..447ba907a
--- /dev/null
+++ b/debian/patches/bugfix/all/kernel-doc-set-man-page-date.patch
@@ -0,0 +1,33 @@
+From: Ben Hutchings <ben@decadent.org.uk>
+Date: Wed, 08 Jul 2015 02:37:21 +0100
+Subject: kernel-doc: Use $KBUILD_BUILD_TIMESTAMP as man page date
+Bug-Debian: https://bugs.debian.org/769844
+
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+--- a/scripts/kernel-doc
++++ b/scripts/kernel-doc
+@@ -253,11 +253,20 @@ my %highlights = %highlights_man;
+ my $blankline = $blankline_man;
+ my $modulename = "Kernel API";
+ my $function_only = 0;
++my $show_not_found = 0;
++
++my @build_time;
++if (defined($ENV{'KBUILD_BUILD_TIMESTAMP'}) &&
++    (my $seconds = `date -d"${ENV{'KBUILD_BUILD_TIMESTAMP'}}" +%s`) ne '') {
++    @build_time = gmtime($seconds);
++} else {
++    @build_time = localtime;
++}
++
+ my $man_date = ('January', 'February', 'March', 'April', 'May', 'June',
+ 		'July', 'August', 'September', 'October',
+-		'November', 'December')[(localtime)[4]] .
+-  " " . ((localtime)[5]+1900);
+-my $show_not_found = 0;
++		'November', 'December')[$build_time[4]] .
++  " " . ($build_time[5]+1900);
+ 
+ # Essentially these are globals.
+ # They probably want to be tidied up, made more localised or something.
diff --git a/debian/patches/series b/debian/patches/series
index 9ee2bbf42..8e1167d9e 100644
--- a/debian/patches/series
+++ b/debian/patches/series
@@ -72,6 +72,7 @@ bugfix/all/make-highlights-deterministic-in-kernel-doc.patch
 bugfix/all/remove-timestamps-from-compressed-man-pages.patch
 bugfix/all/docbook-generate-consistent-ids.patch
 bugfix/all/docbook-fix-duplicate-man-pages.patch
+bugfix/all/kernel-doc-set-man-page-date.patch
 
 # Miscellaneous features
 features/all/efi-autoload-efi-pstore.patch