diff --git a/src/main.rs b/src/main.rs
index d122671..1582e8c 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,7 +8,7 @@ use river_protocols::{
 use serde::ser::{SerializeSeq, SerializeStruct, Serializer};
 use serde::Serialize;
 use wayland_client::protocol::wl_registry::WlRegistry;
-use std::collections::HashMap;
+use std::collections::{BTreeMap, HashMap};
 use wayland_client::protocol::{wl_output, wl_output::WlOutput, wl_seat,
     wl_seat::WlSeat};
 use wayland_client::{Attached, DispatchData, Display, GlobalEvent, GlobalManager, Main};
@@ -22,6 +22,7 @@ struct Flags {
     layout: bool,
     mode: bool,
     focused: bool,
+    gtk_nums: bool,
     seat: Option<String>,
 }
 
@@ -35,6 +36,7 @@ impl Flags {
             layout: false,
             mode: false,
             focused: false,
+            gtk_nums: false,
             seat: None,
         }
     }
@@ -45,7 +47,7 @@ struct Tags(u32);
 
 struct Env {
     flags: Flags,
-    output_names: HashMap<u32, String>,
+    output_names: BTreeMap<u32, String>,
     focused: Option<u32>,
     layout: Option<String>,
     titles: Option<HashMap<u32, String>>,
@@ -89,7 +91,7 @@ impl Serialize for Tags {
 impl Serialize for Env {
     fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error>
     where S: Serializer {
-        let mut state = serializer.serialize_struct("Env", 7)?;
+        let mut state = serializer.serialize_struct("Env", 8)?;
         if let Some(layout) = self.layout.as_ref() {
             state.serialize_field("layout", layout)?;
         } else {
@@ -128,6 +130,18 @@ impl Serialize for Env {
         } else {
             state.skip_field("viewtags")?;
         }
+        if self.flags.gtk_nums {
+            let mut name_id_map = HashMap::<&str, u32>::new();
+            name_id_map.reserve(self.output_names.len());
+            let mut id = 0;
+            for (_, value) in &self.output_names {
+                name_id_map.insert(value, id);
+                id += 1;
+            }
+            state.serialize_field("gtk_ids", &name_id_map)?;
+        } else {
+            state.skip_field("gtk_ids")?;
+        }
         state.end()
     }
 }
@@ -145,7 +159,7 @@ impl Env {
             viewtags: flags.viewtags.then(Default::default),
             status_manager: None,
             flags,
-            output_names: HashMap::default(),
+            output_names: Default::default(),
         }
     }
 
@@ -157,6 +171,7 @@ impl Env {
             || self.viewtags.is_some()
             || self.layout.is_some()
             || self.focused.is_some()
+            || self.flags.gtk_nums
         {
             println!("{}", serde_json::to_string(self).unwrap());
         }
@@ -360,6 +375,7 @@ fn configuration() -> Flags {
                 "--tags" | "-t" => default.tags = true,
                 "--layout" | "-l" => default.layout = true,
                 "--view-tags" | "-vt" => default.viewtags = true,
+                "--gtk-ids" | "-g" => default.gtk_nums = true,
                 "--help" | "-h" => {
                     print!("Usage: ristate [option]\n\n");
                     print!("  --tag | -t                the focused tag of each output\n");
@@ -369,6 +385,7 @@ fn configuration() -> Flags {
                     print!("  --focused | -f            the name of the focused output\n");
                     print!("  --urgency | -u            tags with urgent views on them\n");
                     print!("  --view-tags | -vt         the tags with views on them\n");
+                    print!("  --gtk-ids | -g            attempt to map output names to their gtk id\n");
                     print!("  --seat | -s <string>      select the seat\n");
                     std::process::exit(0);
                 }
@@ -378,7 +395,7 @@ fn configuration() -> Flags {
         }
     }
     if !default.urgency && !default.titles && !default.mode && !default.focused
-        && !default.tags && !default.layout && !default.viewtags {
+        && !default.tags && !default.layout && !default.viewtags && !default.gtk_nums {
             println!("error: You must specify at least one thing to listen for!");
             std::process::exit(1);
         }