diff --git a/src/arch/SConscript b/src/arch/SConscript
index d9c19df..3034dac 100644
--- a/src/arch/SConscript
+++ b/src/arch/SConscript
@@ -59,7 +59,6 @@
 
 env.SwitchingHeaders(
     Split('''
-        decoder.hh
         isa.hh
         vecregs.hh
         '''),