diff --git a/src/main.rs b/src/main.rs
index 1451f1a..aeed5ad 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -14,17 +14,17 @@ use crate::cmd::{Cmd, Execute};
 use crate::error::SilentExit;
 use crate::config_man::{get_config_path, create_config};
 
+const POSTHOG_API_KEY: Option<&str> = option_env!("POSTHOG_API_KEY");
+
 #[tokio::main]
 pub async fn main() -> ExitCode {
     // Forcibly disable backtraces.
     env::remove_var("RUST_LIB_BACKTRACE");
     env::remove_var("RUST_BACKTRACE");
 
-    let key = env::var("POSTHOG_API_KEY");
-    if key.is_err() {
-        println!("POSTHOG_API_KEY is not set");
-    } else {
-        println!("POSTHOG_API_KEY is set");
+    match POSTHOG_API_KEY {
+        Some(key) => println!("POSTHOG_API_KEY is set"),
+        None => eprintln!("Warning: POSTHOG_API_KEY is not set"),
     }
 
     let flag_file = get_config_path().unwrap().with_file_name(".vpm_welcome_shown");