diff --git a/include/dsp.h b/include/dsp.h
index d6a2f85..d7b93d9 100644
--- a/include/dsp.h
+++ b/include/dsp.h
@@ -43,11 +43,11 @@
 #define SIREN_DSP_SLOW
 #endif
 
-#if defined(SIREN_DSP_APPLE_VDSP)
-
 namespace siren {
 namespace dsp {
 
+#if defined(SIREN_DSP_APPLE_VDSP)
+
 // Apple vDSP
 typedef DSPSplitComplex SplitComplex;
 struct FFTWorkspace