diff --git a/Kernel/Process.h b/Kernel/Process.h
index b15b7d61a1..bbad42d35e 100644
--- a/Kernel/Process.h
+++ b/Kernel/Process.h
@@ -290,8 +290,6 @@ public:
     bool has_used_fpu() const { return m_has_used_fpu; }
     void set_has_used_fpu(bool b) { m_has_used_fpu = b; }
 
-    int gui_client_id() const { return (int)this; }
-
     Region* allocate_region_with_vmo(LinearAddress, size_t, RetainPtr<VMObject>&&, size_t offset_in_vmo, String&& name, bool is_readable, bool is_writable);
     Region* allocate_file_backed_region(LinearAddress, size_t, RetainPtr<Inode>&&, String&& name, bool is_readable, bool is_writable);
     Region* allocate_region(LinearAddress, size_t, String&& name, bool is_readable = true, bool is_writable = true, bool commit = true);