diff --git a/modules/util/infer_cloud_products.py b/modules/util/infer_cloud_products.py
index 388ebb0f22b96e94a7fa2ffc0c5172828749275c..7cbad5afa2a7e7828aeb7590be0810f6d41a3ad3 100644
--- a/modules/util/infer_cloud_products.py
+++ b/modules/util/infer_cloud_products.py
@@ -39,7 +39,7 @@ def infer_cloud_products(clvrx_path, output_dir, full_disk=True, satellite='GOES
 
     for pname, t_start, t_stop, dto in clvrx_ds:
         clvrx_str_time = dto.strftime('%Y-%m-%d_%H:%M')
-        out_file = output_dir + 'cloud_fraction_opd' + clvrx_str_time + '.nc'
+        out_file = output_dir + 'cloud_fraction_opd_' + clvrx_str_time + '.nc'
 
         t0 = time.time()
         if full_disk: