diff --git a/opensfm/synthetic_data/synthetic_generator.py b/opensfm/synthetic_data/synthetic_generator.py
index fcfe34ccc..de1aa47a8 100644
--- a/opensfm/synthetic_data/synthetic_generator.py
+++ b/opensfm/synthetic_data/synthetic_generator.py
@@ -167,7 +167,7 @@ def add_shots_to_reconstruction(positions, rotations,
     shift = len(reconstruction.shots)
     for i, item in enumerate(zip(positions, rotations)):
         shot = types.Shot()
-        shot.id = 'shot' + str(shift+i)
+        shot.id = 'shot%04d' % (shift + i)
         shot.camera = camera
         shot.pose = types.Pose()
         shot.pose.set_rotation_matrix(item[1])
diff --git a/opensfm/synthetic_data/synthetic_scene.py b/opensfm/synthetic_data/synthetic_scene.py
index 9d0b12077..164ca3f08 100644
--- a/opensfm/synthetic_data/synthetic_scene.py
+++ b/opensfm/synthetic_data/synthetic_scene.py
@@ -86,7 +86,7 @@ def __init__(self, num_cameras, num_points, noise):
         self.cameras = {}
         for i in range(num_cameras):
             camera = camera = pygeometry.Camera.create_perspective(0.9, -0.1, 0.01)
-            camera.id = 'camera' + str(i)
+            camera.id = 'camera%04d' % i
             camera.height = 600
             camera.width = 800
             self.cameras[camera.id] = camera
@@ -106,8 +106,8 @@ def __init__(self, num_cameras, num_points, noise):
             up = [alpha * 0.2, alpha * 0.2, 1.0]
 
             shot = types.Shot()
-            shot.id = 'shot' + str(i)
-            shot.camera = self.cameras['camera' + str(i)]
+            shot.id = 'shot%04d' % i
+            shot.camera = self.cameras['camera%04d' % i]
             shot.pose = camera_pose(position, lookat, up)
             self.shots[shot.id] = shot