diff --git a/lib/rex/zip/archive.rb b/lib/rex/zip/archive.rb
index e376f85f7e5d..bf4584dc04ce 100644
--- a/lib/rex/zip/archive.rb
+++ b/lib/rex/zip/archive.rb
@@ -37,8 +37,8 @@ def add_file(fname, fdata=nil, xtra=nil, comment=nil)
 			if (st.directory?)
 				attrs = EFA_ISDIR
 				fdata = ''
-				unless fdata[-1] == '/'
-					fdata << '/'
+				unless fname[-1] == '/'
+					fname << '/'
 				end
 			else
 				f = File.open(fname, 'rb')