diff --git a/src/spawn.rs b/src/spawn.rs
index 3950313..14849df 100644
--- a/src/spawn.rs
+++ b/src/spawn.rs
@@ -17,8 +17,7 @@ pub struct FaustHandle {
 
 impl FaustHandle {
     pub async fn spawn() -> Result<Self, std::io::Error> {
-        let bin_path = env::var("FAUST_DSP")
-            .expect("Set FAUST_DSP env variable to path to mixer faust executable");
+        let bin_path = env::var("FAUST_DSP").unwrap_or_else(|_| "dsp/mixer".to_string());
         let bin_path = if !bin_path.starts_with("/") {
             format!(
                 "{}/{}",