diff --git a/rally2.py b/rally2.py
index 6eb6758..1a62cd3 100644
--- a/rally2.py
+++ b/rally2.py
@@ -254,7 +254,7 @@ def turn_90_degrees(noah, est_pose, particles):
     current_position = np.array([est_pose.x, est_pose.y])
     relative_pos = middle - current_position
     angle = np.arctan(relative_pos[1]/relative_pos[0])
-    relative_angle = np.mod(angle - est_pose.theta(), 2.0*np.pi)
+    relative_angle = np.mod(angle - est_pose.theta, 2.0*np.pi)
 
     clockwise = relative_angle > 180