diff --git a/src/system/model.rs b/src/system/model.rs
index cdcb399..e3f9597 100644
--- a/src/system/model.rs
+++ b/src/system/model.rs
@@ -1,3 +1,4 @@
+use std::f32::consts::PI;
 use std::fs::File;
 use std::io::Write;
 use std::io;
@@ -99,7 +100,7 @@ impl<R: Rng, S: Storage, W: Walker<R>> DLASystem<R, S, W> {
     }
 
     fn spawn_particle(&mut self) {
-        let theta = self.rng.gen_range(0f32..1.0);
+        let theta = self.rng.gen_range(0f32..1.0) * 2.0 * PI;
         let (x, y) = (self.add_circle * theta.cos(), self.add_circle * theta.sin());
         let position = Position(x as i32, y as i32);