diff --git a/changes/asciidoc-UTC b/changes/asciidoc-UTC
new file mode 100644
index 000000000..21fbfc1d6
--- /dev/null
+++ b/changes/asciidoc-UTC
@@ -0,0 +1,4 @@
+  o Minor bugfixes (build):
+    - When building manual pages, set the timezone to "UTC", so that the
+      output is reproducible. Fixes bug 19558; bugfix on 0.2.2.9-alpha.
+      Patch from intrigeri.
diff --git a/doc/asciidoc-helper.sh b/doc/asciidoc-helper.sh
index c06b57026..a3ef53f88 100755
--- a/doc/asciidoc-helper.sh
+++ b/doc/asciidoc-helper.sh
@@ -19,7 +19,7 @@ if [ "$1" = "html" ]; then
     base=${output%%.html.in}
 
     if [ "$2" != none ]; then
-      "$2" -d manpage -o $output $input;
+      TZ=UTC "$2" -d manpage -o $output $input;
     else
       echo "==================================";
       echo;