diff --git a/dox/user_guides/iges/iges.md b/dox/user_guides/iges/iges.md
index cbb05d2e74..f374efc2f9 100644
--- a/dox/user_guides/iges/iges.md
+++ b/dox/user_guides/iges/iges.md
@@ -274,11 +274,6 @@ Default values:
 * read.iges.resource.name - IGES,  
 * read.iges.sequence - FromIGES. 
 
-<h4>read.scale.unit</h4>
-This parameter is obsolete (the parameter *xstep.cascade.unit*  should be used instead   when necessary). If it is set to 'M', the shape is scaled 0.001 times (as if it  were in   meters) after translation from IGES or STEP. 
-
-Default value is MM.
-
 <h4>xstep.cascade.unit</h4>
 This parameter defines units to which a shape should be  converted when translated   from IGES or STEP to CASCADE. Normally it is MM; only those applications that   work internally in units other than MM should use this parameter.
   
diff --git a/dox/user_guides/step/step.md b/dox/user_guides/step/step.md
index 2829960c40..e06ef889f4 100644
--- a/dox/user_guides/step/step.md
+++ b/dox/user_guides/step/step.md
@@ -283,10 +283,6 @@ Default values:
 * read.step.resource.name - STEP, 
 * read.step.sequence - FromSTEP. 
 
-<h4>read.scale.unit</h4>
-This parameter is obsolete (the parameter *xstep.cascade.unit* should be used instead when necessary). If it is set to 'M', the shape is scaled 0.001 times (as if it were in meters) after translation from IGES or STEP. 
-Default value is MM. 
-
 <h4>xstep.cascade.unit</h4>
 This parameter defines units to which a shape should be converted when translated from IGES or STEP to CASCADE. Normally it is MM; only those applications that work internally in units other than MM should use this parameter. 
 
diff --git a/src/XSAlgo/XSAlgo.cxx b/src/XSAlgo/XSAlgo.cxx
index 6bbfc2688d..a1c20cebec 100644
--- a/src/XSAlgo/XSAlgo.cxx
+++ b/src/XSAlgo/XSAlgo.cxx
@@ -61,13 +61,6 @@ static Handle(XSAlgo_AlgoContainer) theContainer;
   Interface_Static::Init ("XSTEP","xstep.cascade.unit",'&',"eval UIN");   //11
   Interface_Static::SetCVal ("xstep.cascade.unit","MM");
   
-  //  unit : pour depannage / test de non regression  0 MM  1 M(ancien)
-  Interface_Static::Init("XSTEP"    ,"read.scale.unit", 'e',"");
-  Interface_Static::Init("XSTEP","read.scale.unit",'&',"ematch 0");
-  Interface_Static::Init("XSTEP","read.scale.unit",'&',"eval MM");
-  Interface_Static::Init("XSTEP","read.scale.unit",'&',"eval M");
-  Interface_Static::SetIVal ("read.scale.unit",0);
-
   // init Standard Shape Processing operators
   ShapeProcess_OperLibrary::Init();
 }