diff --git a/completions/zsh/CMakeLists.txt b/completions/zsh/CMakeLists.txt
index 561636f2..ac307d7d 100644
--- a/completions/zsh/CMakeLists.txt
+++ b/completions/zsh/CMakeLists.txt
@@ -1,4 +1,4 @@
 install(
-	FILES _sway _swaymsg _swaygrab
+	FILES _sway _swaymsg _swaygrab _swaylock
 	DESTINATION share/zsh/site-functions/
 )
diff --git a/completions/zsh/_swaylock b/completions/zsh/_swaylock
new file mode 100644
index 00000000..6163c089
--- /dev/null
+++ b/completions/zsh/_swaylock
@@ -0,0 +1,11 @@
+#compdef swaylock
+#
+# Completion script for swaylock
+#
+
+_arguments -s \
+    '(-v --version)'{-v,--version}'[Show the version number and quit]' \
+    '(-h --help)'{-h,--help}'[Show help message and quit]' \
+    '(-c --color)'{-c --color}'[Specify a color (rrggbb) instead of white]' \
+    '(-i --image)'{-i --image}'[Display an image]' \
+    '(-s --scaling)'{-s --scaling}'[Scaling mode: stretch, fill, fit, center, tile]'