diff --git a/src/profile.rs b/src/profile.rs
index 4abf6d7..32f3565 100644
--- a/src/profile.rs
+++ b/src/profile.rs
@@ -1,6 +1,7 @@
 use serde::{Deserialize, Serialize};
 use std::{
-    fs::{create_dir_all, File},
+    collections::HashMap,
+    fs::{create_dir_all, File, OpenOptions},
     io::{BufReader, BufWriter},
     path::Path,
 };
@@ -15,16 +16,17 @@ pub struct Profile {
     libsurvive_enabled: bool,
     basalt_enabled: bool,
     mercury_enabled: bool,
+    environment: HashMap<String, String>,
 }
 
-pub fn load_profile(path: String) -> Result<Profile, serde_json::Error> {
+pub fn load_profile(path: &String) -> Result<Profile, serde_json::Error> {
     let file = File::open(path).unwrap();
     let reader = BufReader::new(file);
     serde_json::from_reader(reader)
 }
 
-pub fn dump_profile(profile: Profile, path_s: String) -> () {
-    let path = Path::new(&path_s);
+pub fn dump_profile(profile: Profile, path_s: &String) -> () {
+    let path = Path::new(path_s);
     match path.parent() {
         Some(parent) => {
             if !parent.is_dir() {
@@ -33,21 +35,24 @@ pub fn dump_profile(profile: Profile, path_s: String) -> () {
         }
         None => {}
     };
-    let file = match path.is_file() {
-        true => File::open(path).expect("Could not open file"),
-        false => File::create(path).expect("Could not create file")
-    };
+    let file = OpenOptions::new()
+        .write(true)
+        .create(true)
+        .open(path)
+        .expect("Could not open file");
     let writer = BufWriter::new(file);
     serde_json::to_writer_pretty(writer, &profile).expect("Could not write profile")
 }
 
 #[cfg(test)]
 mod tests {
-    use super::{dump_profile, Profile, load_profile};
+    use std::collections::HashMap;
+
+    use super::{dump_profile, load_profile, Profile};
 
     #[test]
     fn profile_can_be_loaded() {
-        let profile = load_profile(String::from("./test/files/profile.json"));
+        let profile = load_profile(&"./test/files/profile.json".to_string());
         match profile {
             Ok(profile) => {
                 assert_eq!(profile.monado_path, "/home/user/monado");
@@ -61,6 +66,13 @@ mod tests {
                 assert_eq!(profile.libsurvive_enabled, true);
                 assert_eq!(profile.basalt_enabled, false);
                 assert_eq!(profile.mercury_enabled, false);
+                assert!(profile
+                    .environment
+                    .contains_key("XRT_COMPOSITOR_SCALE_PERCENTAGE"));
+                assert!(profile.environment.contains_key("XRT_COMPOSITOR_COMPUTE"));
+                assert!(profile
+                    .environment
+                    .contains_key("SURVIVE_GLOBALSCENESOLVER"));
             }
             Err(_) => assert!(false),
         }
@@ -68,6 +80,12 @@ mod tests {
 
     #[test]
     fn profile_can_be_dumped() {
+        let mut env = HashMap::new();
+        env.insert(
+            "XRT_COMPOSITOR_SCALE_PERCENTAGE".to_string(),
+            "140".to_string(),
+        );
+        env.insert("XRT_COMPOSITOR_COMPUTE".to_string(), "1".to_string());
         let p = Profile {
             monado_path: String::from("/home/user/monado"),
             openovr_path: String::from("/home/user/openovr"),
@@ -77,7 +95,21 @@ mod tests {
             libsurvive_enabled: true,
             basalt_enabled: false,
             mercury_enabled: false,
+            environment: env,
         };
-        dump_profile(p, String::from("./target/testout/testprofile.json"))
+        let fpath = String::from("./target/testout/testprofile.json");
+        dump_profile(p, &fpath);
+        let loaded = load_profile(&fpath).unwrap();
+        assert_eq!(
+            loaded.libsurvive_path,
+            Some(String::from("/home/user/libsurvive"))
+        );
+        assert_eq!(
+            loaded
+                .environment
+                .get("XRT_COMPOSITOR_COMPUTE")
+                .expect("Key XRT_COMPOSITOR_COMPUTE not found"),
+            "1"
+        );
     }
 }
diff --git a/test/files/profile.json b/test/files/profile.json
index 95636c4..31f99f5 100644
--- a/test/files/profile.json
+++ b/test/files/profile.json
@@ -6,5 +6,10 @@
     "mercury_path": null,
     "libsurvive_enabled": true,
     "basalt_enabled": false,
-    "mercury_enabled": false
+    "mercury_enabled": false,
+    "environment": {
+        "XRT_COMPOSITOR_SCALE_PERCENTAGE": "140",
+        "XRT_COMPOSITOR_COMPUTE": "1",
+        "SURVIVE_GLOBALSCENESOLVER": "0"
+    }
 }