diff --git a/xtask/src/main.rs b/xtask/src/main.rs
index f517299..d21d757 100644
--- a/xtask/src/main.rs
+++ b/xtask/src/main.rs
@@ -366,7 +366,7 @@ fn run_local_docker(port: u16) -> Result<Child, DynError> {
             "--env",
             "RUST_LOG=error",
             "--env",
-            format!("ROCKET_PORT={}", port).as_str(),
+            format!("PORT={}", port).as_str(),
             "--network=host",
             "--rm",
             "local_snake",
@@ -396,7 +396,7 @@ fn run_production(port: u16) -> Result<Child, DynError> {
             "--env",
             "RUST_LOG=error",
             "--env",
-            format!("ROCKET_PORT={}", port).as_str(),
+            format!("PORT={}", port).as_str(),
             "--network=host",
             "--rm",
             "docker.mkaenner.de/snake:latest",