diff --git a/bindings/ruby/extconf.rb b/bindings/ruby/extconf.rb
index 9a3bb4ac..ea2aec65 100644
--- a/bindings/ruby/extconf.rb
+++ b/bindings/ruby/extconf.rb
@@ -66,7 +66,7 @@ system('perl -Mlib=.. -MSigarWrapper -e generate Ruby .')
 $distcleanfiles = ['rbsigar_generated.rx']
 #XXX seems mkmf forces basename on srcs
 #XXX should be linking against libsigar anyhow
-Dir["../../src/*.c","#{osdir}/*.c"].each do |file|
+(Dir["../../src/*.c"] + Dir["#{osdir}/*.c"]).each do |file|
   cf = File.basename(file)
   print file + ' -> ' + cf + "\n"
   if is_win32