diff --git a/ihm_validation/ihm_validator.py b/ihm_validation/ihm_validator.py
index 00d01356..ce0e50dc 100755
--- a/ihm_validation/ihm_validator.py
+++ b/ihm_validation/ihm_validator.py
@@ -276,7 +276,9 @@ def write_json(mmcif_file: str, template_dict: dict, dirName: str, dirName_Outpu
     report = WriteReport(args.f,
                          db=args.databases_root,
                          cache=args.cache_root,
-                         nocache=args.nocache)
+                         nocache=args.nocache,
+                         enable_sas=args.enable_sas,
+                         enable_cx=args.enable_cx)
 
     logging.info("Entry composition")
     template_dict = report.run_entry_composition(Template_Dict)
diff --git a/ihm_validation/report.py b/ihm_validation/report.py
index 864e0957..e3486158 100644
--- a/ihm_validation/report.py
+++ b/ihm_validation/report.py
@@ -15,7 +15,6 @@
 import excludedvolume
 import molprobity
 import get_plots, sas, sas_plots
-import cx
 import utility
 import pickle
 import json
@@ -27,7 +26,8 @@
 REPORT_VERSION = '2.0-dev'
 
 class WriteReport(object):
-    def __init__(self, mmcif_file, db, cache, nocache=False):
+    def __init__(self, mmcif_file, db, cache, nocache=False,
+                 enable_sas=True, enable_cx=False):
         self.mmcif_file = mmcif_file
         self.db = db
         self.input = GetInputInformation(self.mmcif_file)
@@ -37,6 +37,9 @@ def __init__(self, mmcif_file, db, cache, nocache=False):
         self.nocache = nocache
         self.report_version = REPORT_VERSION
 
+        if enable_cx:
+            import cx
+
     def create_webdriver(self) -> webdriver.Firefox:
         '''instantiate webdriver for rendering plots'''
         firefox_options = webdriver.FirefoxOptions()