diff --git a/spectral/knights/Main.lhs b/spectral/knights/Main.lhs
index 022c1012419c7359a2d87d11ea43b4332716f89a..31b282ae2368052f294ba1d30e4435092ac03d4c 100644
--- a/spectral/knights/Main.lhs
+++ b/spectral/knights/Main.lhs
@@ -5,6 +5,7 @@
 \section{The Main Program.}
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%M O D U L E%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \begin{code}
+{-# LANGUAGE CPP #-}
 module Main(main) where
 \end{code}
 %%%%%%%%%%%%%%%%%% I M P O R T S  /  T Y P E   D E F S %%%%%%%%%%%%%%
diff --git a/spectral/knights/Makefile b/spectral/knights/Makefile
index 4177b3bbfb85099785d28641735373a663d3cb3a..1a008b5e37fc812759f387a72893e667d699a19a 100644
--- a/spectral/knights/Makefile
+++ b/spectral/knights/Makefile
@@ -1,8 +1,6 @@
 TOP = ../..
 include $(TOP)/mk/boilerplate.mk
 
-SRC_HC_OPTS += -cpp
-
 FAST_OPTS = 8 1
 NORM_OPTS = 14 1
 SLOW_OPTS = 20 1