diff --git a/ChangeLog b/ChangeLog
index 817379927..81d8c699e 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+2021-10-13  Matthew Martin  <phy1729@gmail.com>
+
+	* 49441: Completion/Unix/Command/_timeout: Add OpenBSD.
+
 2021-10-11  Jun-ichi Takimoto  <takimoto-j@kba.biglobe.ne.jp>
 
 	* 49464: Completion/Linux/Command/_basenc: new completion
diff --git a/Completion/Unix/Command/_timeout b/Completion/Unix/Command/_timeout
index 223059e4d..2235fa5ec 100644
--- a/Completion/Unix/Command/_timeout
+++ b/Completion/Unix/Command/_timeout
@@ -2,8 +2,8 @@
 
 local args
 
-if [[ $service = g* || $OSTYPE != *(freebsd|netbsd)* ]]; then
-  # GNU coreutils or DFly as opposed to Free/NetBSD implementation
+if [[ $service = g* || $OSTYPE != *(freebsd|netbsd|openbsd)* ]]; then
+  # GNU coreutils or DFly as opposed to Free/Net/OpenBSD implementation
   args=(
     '(-v --verbose)'{-v,--verbose}'[indicate when signal is sent upon timeout]'
     '(- *)--help[display usage information]'