diff --git a/src/events.rs b/src/events.rs
index 70d04e1..0f72220 100644
--- a/src/events.rs
+++ b/src/events.rs
@@ -5,7 +5,7 @@ use enum_map::Enum;
 use enumset::EnumSetType;
 use nalgebra::{Vector2, Vector3};
 
-use crate::{ego::engine::MotionState, simdata::StreamType};
+use crate::ego::engine::MotionState;
 
 #[derive(Clone, Copy, Default, Debug)]
 pub enum Scene {
@@ -105,6 +105,9 @@ pub enum SensorSource {
     Annotations
 }
 
+#[cfg(feature="simulation")]
+use crate::simdata::StreamType;
+#[cfg(feature="simulation")]
 impl From<StreamType> for SensorSource {
     fn from(value: StreamType) -> Self {
         match value {
diff --git a/src/lib.rs b/src/lib.rs
index 53a12b3..965bbe9 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -8,6 +8,8 @@ pub mod animation;
 pub mod idle;
 pub mod logging;
 pub mod graphics;
+
+#[cfg(feature="simulation")]
 pub mod simdata;
 
 extern crate alloc;