diff --git a/SConstruct b/SConstruct
index 109db70..b782d90 100644
--- a/SConstruct
+++ b/SConstruct
@@ -39,6 +39,7 @@ if not conf.CheckFunc('pthread_barrier_init'):
 env = conf.Finish()
 
 env.Append(CFLAGS = ' -O3 -Wall -g')
+env.Append(CPPFLAGS = ' -O3 -Wall -g')
 #env.Append(CPPFLAGS  = ' -D_GNU_SOURCE -D__STDC_FORMAT_MACROS')
 #env.Append(CPPFLAGS = ' -DUSE_ADAPTIVE_SAMPLER')