diff --git a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT.h b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT.h
index 2c74773..ff6ce1a 100644
--- a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT.h
+++ b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <voicesmith/Header.h>
+
 #include <voicesmith/etc/FFT/PocketFFT.h>
 #include <voicesmith/etc/FFT/PrettyFastFFT.h>
 
diff --git a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PocketFFT.h b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PocketFFT.h
index cf3ce3c..8a00fcd 100644
--- a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PocketFFT.h
+++ b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PocketFFT.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <voicesmith/Header.h>
+
 #include <StftPitchShift/FFT.h>
 
 #include <pocketfft_hdronly.h>
diff --git a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PrettyFastFFT.h b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PrettyFastFFT.h
index 53d7669..2323dba 100644
--- a/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PrettyFastFFT.h
+++ b/voicesmith/src/main/cpp/de/jurihock/voicesmith/etc/FFT/PrettyFastFFT.h
@@ -1,5 +1,7 @@
 #pragma once
 
+#include <voicesmith/Header.h>
+
 #include <StftPitchShift/FFT.h>
 
 #include <pffft.h>