diff --git a/tconfpy.py b/tconfpy.py
index 49a6a6a..5cdc1ec 100755
--- a/tconfpy.py
+++ b/tconfpy.py
@@ -6,7 +6,7 @@
 # Program Information
 
 PROGNAME = "tconfpy"
-RCSID = "$Id: tconfpy.py,v 1.132 2004/03/24 09:33:44 tundra Exp $"
+RCSID = "$Id: tconfpy.py,v 1.133 2004/03/24 09:56:05 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -233,6 +233,7 @@
 Messages["eENDIFMISS"]   = FILENUM + "Missing %d" + " '%s' " % ENDIF + " Statement(s)"
 Messages["eEQUIVEXTRA"]  = FILENUM + "Only a single '%s' Or '%s' Operator Permitted" % (EQUIV, NOTEQUIV)
 Messages["eIFEXTRATXT"]  = FILENUM + "Extra Text On Line.  '%s' Only Accepts Variable References As Arguments"
+Messages["eVARREADONLY"] = FILENUM + "Variable '%s' Is Read-Only.  Cannot Change Its Value"
 Messages["eVARUNDEF"]    = FILENUM + "Attempt To Reference Undefined Variable '%s'"
 
 
@@ -753,10 +754,19 @@
                 l = line[:e].strip()
                 r = line[e+1:].strip()
 
-                # Construct the entry and load it into the symbol table
-                d = VarDescriptor()
-                d.Value = r
-                SymTable[l] = d
+                # Suppress any attempt to change a RO variable
+
+                if l in SymTable and not SymTable[l].Writeable:
+
+                    ErrorMsg("eVARREADONLY", (cfgfile, linenum, l))
+                    
+                # Load variable into the symbol table
+
+                else:
+
+                    d = VarDescriptor()
+                    d.Value = r
+                    SymTable[l] = d
             
         #####
         # Line Format Is Not In One Of The Recognized Forms - Syntax Error