diff --git a/rtiow/src/bin/tracer.rs b/rtiow/src/bin/tracer.rs
index a862134..cd9f3c9 100644
--- a/rtiow/src/bin/tracer.rs
+++ b/rtiow/src/bin/tracer.rs
@@ -88,8 +88,10 @@ fn push_metrics(push_gateway_addr: &str, instance: String, start_time: &DateTime
     }
 }
 
+#[cfg(not(feature = "profile"))]
 struct MockTimer;
 
+#[cfg(not(feature = "profile"))]
 impl MockTimer {
     fn start<T: Into<Vec<u8>>>(&self, _: T) -> Result<(), ()> {
         Ok(())
@@ -99,8 +101,10 @@ impl MockTimer {
     }
 }
 
+#[cfg(not(feature = "profile"))]
 struct MockProfiler;
 
+#[cfg(not(feature = "profile"))]
 impl MockProfiler {
     fn lock(&self) -> Option<MockTimer> {
         Some(MockTimer {})
diff --git a/rtiow/src/lib.rs b/rtiow/src/lib.rs
index 5274097..1f6c240 100644
--- a/rtiow/src/lib.rs
+++ b/rtiow/src/lib.rs
@@ -31,7 +31,5 @@ extern crate structopt;
 #[macro_use]
 extern crate serde_derive;
 #[macro_use]
-extern crate lazy_static;
-#[macro_use]
 #[cfg(feature = "prom")]
 extern crate prometheus;
diff --git a/rtiow/src/renderer.rs b/rtiow/src/renderer.rs
index ce4583a..d11e480 100644
--- a/rtiow/src/renderer.rs
+++ b/rtiow/src/renderer.rs
@@ -15,6 +15,8 @@ use std::time;
 
 use image;
 use image::RgbImage;
+#[cfg(feature = "prom")]
+use lazy_static::lazy_static;
 use num_cpus;
 use rand;
 use rand::Rng;
@@ -36,7 +38,9 @@ lazy_static! {
         register_counter_vec!("rays", "Number of rays fired", &["level"]).unwrap();
 }
 
+#[cfg(not(feature = "prom"))]
 struct MockPrometheus;
+#[cfg(not(feature = "prom"))]
 impl MockPrometheus {
     fn with_label_values(&self, _: &[&str]) -> &MockPrometheus {
         self