diff --git a/kitty/cocoa_window.m b/kitty/cocoa_window.m
index bcba45926..4013edc5b 100644
--- a/kitty/cocoa_window.m
+++ b/kitty/cocoa_window.m
@@ -21,6 +21,12 @@
 #define NSEventModifierFlagControl NSControlKeyMask
 #endif
 
+typedef int CGSConnectionID;
+typedef int CGSWindowID;
+typedef int CGSWorkspaceID;
+extern CGSConnectionID _CGSDefaultConnection(void);
+extern void CGSGetWindowWorkspace(const CGSConnectionID cid, CGSWindowID wid, CGSWorkspaceID *workspace);
+
 static NSMenuItem* title_menu = NULL;
 
 
@@ -363,6 +369,14 @@ cocoa_focus_window(void *w) {
     [window makeKeyWindow];
 }
 
+int
+cocoa_get_workspace_id(void *w) {
+    NSWindow *window = (NSWindow*)w;
+    int ans = 0;
+    CGSGetWindowWorkspace(_CGSDefaultConnection(), [window windowNumber], &ans);
+    return ans;
+}
+
 bool
 cocoa_toggle_fullscreen(void *w, bool traditional) {
     NSWindow *window = (NSWindow*)w;