diff --git a/nerfstudio/process_data/colmap_utils.py b/nerfstudio/process_data/colmap_utils.py
index 86f3a1524..83188c005 100644
--- a/nerfstudio/process_data/colmap_utils.py
+++ b/nerfstudio/process_data/colmap_utils.py
@@ -156,7 +156,7 @@ def run_colmap(
         f"--output_path {sparse_dir}",
     ]
     if colmap_version >= 3.7:
-        mapper_cmd.append("--Mapper.ba_global_function_tolerance 1e-6")
+        mapper_cmd.append("--Mapper.ba_global_function_tolerance=1e-6")
 
     mapper_cmd = " ".join(mapper_cmd)