diff --git a/ext/wiringpi/extconf.rb b/ext/wiringpi/extconf.rb
index 4b8fc66..f2c2880 100755
--- a/ext/wiringpi/extconf.rb
+++ b/ext/wiringpi/extconf.rb
@@ -1,9 +1,6 @@
 require 'mkmf'
 
-$srcs = Dir.glob('WiringPi/wiringPi/*.c')
+$srcs = ["WiringPi/wiringPi/wiringPi.c", "WiringPi/wiringPi/wiringShift.c", "WiringPi/wiringPi/wiringSerial.c"]
 $objs = $srcs.map{ |file| file.sub('.c','.o') }
-$srcs << 'wiringpi_wrap.c'
-$objs << 'wiringpi_wrap.o'
 
 create_makefile('wiringpi/wiringpi')
-