diff --git a/tconfpy.py b/tconfpy.py
index 5cdc1ec..5171239 100755
--- a/tconfpy.py
+++ b/tconfpy.py
@@ -6,7 +6,7 @@
 # Program Information
 
 PROGNAME = "tconfpy"
-RCSID = "$Id: tconfpy.py,v 1.133 2004/03/24 09:56:05 tundra Exp $"
+RCSID = "$Id: tconfpy.py,v 1.134 2004/03/24 10:08:33 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -765,8 +765,19 @@
                 else:
 
                     d = VarDescriptor()
-                    d.Value = r
-                    SymTable[l] = d
+
+                    # If this is a newly defined variable, set its
+                    # default to be this first value assigned and
+                    # create the new entry
+
+                    if l not in SymTable:
+                        d.Default = r
+                        d.Value = r
+                        SymTable[l] = d
+
+                    # Otherwise, update an existing entry
+
+                    SymTable[l].Value = r
             
         #####
         # Line Format Is Not In One Of The Recognized Forms - Syntax Error