diff --git a/include/siren.h b/include/siren.h
index c6fab52..3fbc29b 100644
--- a/include/siren.h
+++ b/include/siren.h
@@ -1,5 +1,5 @@
 //
-//  hydra.h
+//  siren.h
 //  Kraken Engine / Siren
 //
 //  Copyright 2023 Kearwood Gilbert. All rights reserved.
diff --git a/src/dsp_slow.cpp b/src/dsp_slow.cpp
index da64cd7..b7ec9ac 100644
--- a/src/dsp_slow.cpp
+++ b/src/dsp_slow.cpp
@@ -31,14 +31,14 @@
 
 #include "../include/dsp.h"
 
+#ifdef SIREN_DSP_SLOW
+
 // _USE_MATH_DEFINES must be defined to get M_PI in Windows
 #define _USE_MATH_DEFINES
 #include <math.h>
 
 #include <assert.h>
 
-#ifdef SIREN_DSP_SLOW
-
 namespace siren {
 namespace dsp {