diff --git a/FMDownsampler.h b/FMDownsampler.h
index 4427565..ab91bd0 100644
--- a/FMDownsampler.h
+++ b/FMDownsampler.h
@@ -23,7 +23,6 @@
 #include "Config.h"
 #include "RingBuffer.h"
 #include "FMSamplePairPack.h"
-#include "FMDirectForm1.h"
 
 class CFMDownsampler {
 public: