diff --git a/src/Camera.cpp b/src/Camera.cpp
index 0b95c94..7c0aa16 100644
--- a/src/Camera.cpp
+++ b/src/Camera.cpp
@@ -39,7 +39,7 @@ void Camera::rotate(const Vec3d& rotation)
     gaze = z_rotation * gaze;
     gaze_up = z_rotation * gaze_up;
 
-    Quaternion y_rotation{0,sin(rotation.y),0,cos(rotation.y)};
+    Quaternion y_rotation{0,sin(rotation.y/2),0,cos(rotation.y/2)};
     y_rotation.normalize();
     gaze = y_rotation * gaze;
     gaze_up = y_rotation * gaze_up;