diff --git a/cmd/main.go b/cmd/main.go
index 688bc86..453d080 100644
--- a/cmd/main.go
+++ b/cmd/main.go
@@ -62,7 +62,10 @@ func main() {
 
 	// We run it in a goroutine so it doesn't block main from reaching the signal listener.
 	go func() {
-		addr := ":3000"
+		addr := os.Getenv("SERVER_PORT")
+		if connStr == "" {
+			log.Fatal("SERVER_PORT environment variable is not set")
+		}
 		fmt.Printf("Server starting on %s\n", addr)
 
 		if err := server.Start(addr); err != nil && err != http.ErrServerClosed {