diff --git a/opendm/osfm.py b/opendm/osfm.py
index c99e014c..abc26f02 100644
--- a/opendm/osfm.py
+++ b/opendm/osfm.py
@@ -135,7 +135,7 @@ class OSFMContext:
             # create config file for OpenSfM
             config = [
                 "use_exif_size: no",
-                "flann_algorithm": "KDTREE", # more stable, faster than KMEANS
+                "flann_algorithm: KDTREE", # more stable, faster than KMEANS
                 "feature_process_size: %s" % args.resize_to,
                 "feature_min_frames: %s" % args.min_num_features,
                 "processes: %s" % args.max_concurrency,