diff --git a/CHANGELOG.md b/CHANGELOG.md
index eda1389b..d0d1889d 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -7,6 +7,10 @@ CHANGELOG for FlatCAM beta
 
 =================================================
 
+20.03.2021
+
+- removed another parameter in the serialized parameters for CNCJob object (no longer used) which made the project saving to fail (when CNCjob objects are in the project)
+
 19.03.2021
 
 - fixed mouse bytes generation if Cutout Plugin to add an extra drill hole at the end
diff --git a/appObjects/FlatCAMCNCJob.py b/appObjects/FlatCAMCNCJob.py
index eb3d9a2b..d1396bb0 100644
--- a/appObjects/FlatCAMCNCJob.py
+++ b/appObjects/FlatCAMCNCJob.py
@@ -175,7 +175,7 @@ class CNCJobObject(FlatCAMObj, CNCjob):
         # Always append to it because it carries contents
         # from predecessors.
         self.ser_attrs += [
-            'options', 'kind', 'cnc_tools', 'exc_cnc_tools', 'multitool', 'append_snippet',
+            'options', 'kind', 'tools', 'multitool', 'append_snippet',
             'prepend_snippet', 'gc_header'
         ]