diff --git a/tren.py b/tren.py
index e0d5cb1..54fed8f 100755
--- a/tren.py
+++ b/tren.py
@@ -9,7 +9,7 @@
 BASENAME = PROGNAME.split(".py")[0]
 PROGENV  = BASENAME.upper()
 INCLENV  = PROGENV + "INCL"
-RCSID = "$Id: tren.py,v 1.227 2010/08/25 19:26:25 tundra Exp $"
+RCSID = "$Id: tren.py,v 1.228 2010/08/25 19:47:35 tundra Exp $"
 VERSION = RCSID.split()[2]
 
 # Copyright Information
@@ -2045,9 +2045,18 @@
 # or from a Windows shell that doesn't know how to handle globbing
 # properly.
 
+# If the glob expands to nothing, then supply the original string.
+# That way an error will be thrown if either an explicitly named file
+# does not exist, or if a wildcard expands to nothing.
+
 expandedlist = []
 for arg in args:
-    expandedlist += glob.glob(arg)
+
+    wc = glob.glob(arg)
+    if wc:
+        expandedlist += wc
+    else:
+        expandedlist.append(arg)
 
 targs = RenameTargets(expandedlist)