diff --git a/signalgen.py b/signalgen.py
index 58903ab..1c47815 100755
--- a/signalgen.py
+++ b/signalgen.py
@@ -86,7 +86,7 @@ def processList(values):
 		dirs = listfile.readlines()
 		for dir in dirs:
 			dataName = path.dirname(dir[:-1]) #strip the trailing slash for dirname
-			values.file = path.join(dir,dataname+".fil")
+			values.file = path.join(dir,dataName+".fil")
 			addBurst(values)
 
 def processDir(values, fileList):