diff --git a/decoder_modules/ryfi_decoder/src/ryfi/conv_codec.h b/decoder_modules/ryfi_decoder/src/ryfi/conv_codec.h
index 10c0ae61e..efef7d426 100644
--- a/decoder_modules/ryfi_decoder/src/ryfi/conv_codec.h
+++ b/decoder_modules/ryfi_decoder/src/ryfi/conv_codec.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stdint.h>
+#include <stddef.h>
 #include "dsp/processor.h"
 
 extern "C" {
diff --git a/decoder_modules/ryfi_decoder/src/ryfi/framing.h b/decoder_modules/ryfi_decoder/src/ryfi/framing.h
index 7b4739a23..e30ff21eb 100644
--- a/decoder_modules/ryfi_decoder/src/ryfi/framing.h
+++ b/decoder_modules/ryfi_decoder/src/ryfi/framing.h
@@ -1,6 +1,7 @@
 #pragma once
 #include "dsp/processor.h"
 #include <stdint.h>
+#include <stddef.h>
 
 namespace ryfi {
     // Synchronization word.
diff --git a/decoder_modules/ryfi_decoder/src/ryfi/packet.h b/decoder_modules/ryfi_decoder/src/ryfi/packet.h
index 6c62fa165..1df5b6fc6 100644
--- a/decoder_modules/ryfi_decoder/src/ryfi/packet.h
+++ b/decoder_modules/ryfi_decoder/src/ryfi/packet.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stdint.h>
+#include <stddef.h>
 
 namespace ryfi {
     /**
diff --git a/decoder_modules/ryfi_decoder/src/ryfi/rs_codec.h b/decoder_modules/ryfi_decoder/src/ryfi/rs_codec.h
index 97cdefdd4..367028518 100644
--- a/decoder_modules/ryfi_decoder/src/ryfi/rs_codec.h
+++ b/decoder_modules/ryfi_decoder/src/ryfi/rs_codec.h
@@ -1,5 +1,6 @@
 #pragma once
 #include <stdint.h>
+#include <stddef.h>
 #include "dsp/processor.h"
 
 extern "C" {