diff --git a/README.md b/README.md
index c50f34f..279ee05 100644
--- a/README.md
+++ b/README.md
@@ -13,9 +13,9 @@ Environment variables
 | Env Key       | Env Value                                                      |
 |---------------|----------------------------------------------------------------|
 | `HOME`        | User home, default by OS system                                |
-| `SKIP_CACHE`  | Skip compiled cached file , turn on `true`, `yes`, `on` or `1` |
-| `RUST_SCRIPT` | `rust_script` command line bin file                            |
-| `MAX_SCRIPT_LEN` | Max script length                                              |
+| `RUNRS_SKIP_CACHE`  | Skip compiled cached file , turn on `true`, `yes`, `on` or `1` |
+| `RUNRS_RUST_SCRIPT` | `rust_script` command line bin file                            |
+| `RUNRS_MAX_SCRIPT_LEN` | Max script length                                              |
 
 <br>
 
diff --git a/src/main.rs b/src/main.rs
index d632b64..f474880 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -36,7 +36,7 @@ fn main() {
 }
 
 fn build_script_command(rust_script: PathBuf, script_file: &str, script_sha256: &str, cache_script_bin_name: &str) -> Command {
-    let skip_cache = is_env_on("SKIP_CACHE");
+    let skip_cache = is_env_on("RUNRS_SKIP_CACHE");
     let cache_script_bin_name_exists = fs::metadata(&cache_script_bin_name).is_ok();
     debugging!("Bin name: {} {}exists", cache_script_bin_name, iff!(cache_script_bin_name_exists, "", "not "));
     if !skip_cache && cache_script_bin_name_exists {
@@ -98,7 +98,7 @@ runrs <script.rs> [arguments]
 
 fn read_file_and_digest(script_file: &str) -> (String, String) {
     let default_max_script_len = 1024 * 1024;
-    let max_script_len: u64 = env::var("MAX_SCRIPT_LEN")
+    let max_script_len: u64 = env::var("RUNRS_MAX_SCRIPT_LEN")
         .map(|len| len.parse().unwrap_or_else(|| default_max_script_len)).unwrap_or_else(|| default_max_script_len);
     match fs::metadata(script_file) {
         Err(_) => failure_and_exit!("Script file not exists: {}", script_file),
@@ -117,7 +117,7 @@ fn read_file_and_digest(script_file: &str) -> (String, String) {
 }
 
 fn get_run_script_bin_name(home: &str) -> PathBuf {
-    if let Ok(rust_script) = env::var("RUST_SCRIPT") {
+    if let Ok(rust_script) = env::var("RUNRS_RUST_SCRIPT") {
         let rust_script_path_buf = PathBuf::from(&rust_script);
         if !rust_script_path_buf.exists() {
             warning!("RUST_SCRIPT={} not exists", &rust_script);