diff --git a/AudioSettings_F32.cpp b/AudioSettings_F32.cpp
index 195cb69..fb3eefc 100644
--- a/AudioSettings_F32.cpp
+++ b/AudioSettings_F32.cpp
@@ -1,5 +1,5 @@
 
-
+#include <Arduino.h>
 #include "AudioSettings_F32.h"
 #include "AudioStream_F32.h"
 
diff --git a/AudioSettings_F32.h b/AudioSettings_F32.h
index 7832af7..88bdd4a 100644
--- a/AudioSettings_F32.h
+++ b/AudioSettings_F32.h
@@ -2,9 +2,11 @@
 #ifndef _AudioSettings_F32_
 #define _AudioSettings_F32_
 
+#include <AudioStream.h> // for AUDIO_SAMPLE_RATE_EXACT, AUDIO_BLOCK_SAMPLES
+
 class AudioSettings_F32 {
 	public:
-		AudioSettings_F32(float fs_Hz, int block_size) :
+		AudioSettings_F32(float fs_Hz=AUDIO_SAMPLE_RATE_EXACT, int block_size=AUDIO_BLOCK_SAMPLES) :
 			sample_rate_Hz(fs_Hz), audio_block_samples(block_size) {}
 		const float sample_rate_Hz;
 		const int audio_block_samples;