diff --git a/src/emscripten/mako.cpp b/src/emscripten/mako.cpp
index dd7c373..492b82a 100644
--- a/src/emscripten/mako.cpp
+++ b/src/emscripten/mako.cpp
@@ -13,7 +13,6 @@
 namespace {
 
 std::unique_ptr<MakoFMgen> fm;
-uint8* fmdata;
 
 } // namespace
 
@@ -45,9 +44,7 @@ void MAKO::play_music(int page)
 		uint8* data = dri.load(amus, page, &size);
 		if (!data)
 			return;
-		fm = std::make_unique<MakoFMgen>(data);
-		free(fmdata);
-		fmdata = data;
+		fm = std::make_unique<MakoFMgen>(data, true);
 		EM_ASM({ xsystem35.audio.enable_audio_hook(); });
 	} else {
 		auto midi = std::make_unique<MAKOMidi>(nact, amus);
@@ -77,8 +74,6 @@ void MAKO::stop_music()
 	});
 
 	fm = nullptr;
-	free(fmdata);
-	fmdata = nullptr;
 	current_music = 0;
 }
 
diff --git a/src/fm/mako_fmgen.cpp b/src/fm/mako_fmgen.cpp
index 03b93e1..d2fa09a 100644
--- a/src/fm/mako_fmgen.cpp
+++ b/src/fm/mako_fmgen.cpp
@@ -6,8 +6,8 @@
 const int SAMPLE_RATE = 44100;
 const int OPNA_CLOCK = 3993600 * 2;
 
-MakoFMgen::MakoFMgen(const uint8_t* data) :
-	MakoFM(data),
+MakoFMgen::MakoFMgen(const uint8_t* data, bool free_data) :
+	MakoFM(data, free_data),
 	sync_ms(0),
 	samples_left(0) {
 	bool ok = opna.Init(OPNA_CLOCK, SAMPLE_RATE, false);
@@ -49,7 +49,7 @@ void MakoFMgen::Mix(int samples) {
 		samples_left = samples - out_samples;
 		samples = out_samples;
 	}
-	FM_SAMPLETYPE* buf = new FM_SAMPLETYPE[samples * 2];
+	FM_SAMPLETYPE* buf = (FM_SAMPLETYPE*)alloca(samples * 2 * sizeof(FM_SAMPLETYPE));
 	memset(buf, 0, samples * sizeof(FM_SAMPLETYPE) * 2);
 	opna.Mix(buf, samples);
 	for (int i = 0; i < samples * 2; i += 2) {
@@ -58,5 +58,4 @@ void MakoFMgen::Mix(int samples) {
 	}
 	out_samples -= samples;
 	output += samples * 2;
-	delete[] buf;
 }
diff --git a/src/fm/mako_fmgen.h b/src/fm/mako_fmgen.h
index e55c06f..17d5bd8 100644
--- a/src/fm/mako_fmgen.h
+++ b/src/fm/mako_fmgen.h
@@ -6,7 +6,7 @@
 
 class MakoFMgen : private MakoFM {
 public:
-	MakoFMgen(const uint8_t* data);
+	MakoFMgen(const uint8_t* data, bool free_data);
 	void Process(int16* stream, int len);
 
 private:
diff --git a/src/fm/makofm.cpp b/src/fm/makofm.cpp
index 243f38f..c6174c5 100644
--- a/src/fm/makofm.cpp
+++ b/src/fm/makofm.cpp
@@ -1,6 +1,7 @@
 #include "makofm.h"
 #include <algorithm>
 #include <assert.h>
+#include <stdlib.h>
 #include <string.h>
 #include "common.h"
 
@@ -42,8 +43,9 @@ const uint8_t PresetFMTone[TONE_DATA_SIZE] = {
 
 } // namespace
 
-MakoFM::MakoFM(const uint8_t* data) :
+MakoFM::MakoFM(const uint8_t* data, bool free_data) :
 	data(data),
+	free_data(free_data),
 	tone_offset(GetWord(0)),
 	ver(GetWord(2)) {
 	memset(work, 0, sizeof(work));
@@ -57,6 +59,11 @@ MakoFM::MakoFM(const uint8_t* data) :
 	}
 }
 
+MakoFM::~MakoFM() {
+	if (free_data)
+		free((void*)data);
+}
+
 void MakoFM::MainLoop() {
 	if (time_ms == 0.0) {
 		InitOPNA();
diff --git a/src/fm/makofm.h b/src/fm/makofm.h
index 622b4b9..b97d0cd 100644
--- a/src/fm/makofm.h
+++ b/src/fm/makofm.h
@@ -12,7 +12,8 @@ const int MAKO_MAXCH = 9;
 // [2] http://mydocuments.g2.xrea.com/html/p6/makop6.html
 class MakoFM {
 public:
-	MakoFM(const uint8_t* data);
+	MakoFM(const uint8_t* data, bool free_data);
+	~MakoFM();
 	void MainLoop();
 
 	float GetTime() const { return time_ms; }
@@ -116,6 +117,7 @@ private:
 
 	Work work[9];
 	const uint8_t* data;
+	const bool free_data;
 	uint16_t tone_offset;
 	uint16_t ver;
 
diff --git a/src/linux/mako.cpp b/src/linux/mako.cpp
index 1208649..935567c 100644
--- a/src/linux/mako.cpp
+++ b/src/linux/mako.cpp
@@ -25,7 +25,6 @@ Mix_Music *mix_music;
 Mix_Chunk *mix_chunk;
 SDL_mutex* fm_mutex;
 std::unique_ptr<MakoFMgen> fm;
-uint8* fmdata;
 
 void FMHook(void *udata, Uint8 *stream, int len) {
 	SDL_LockMutex(fm_mutex);
@@ -114,9 +113,7 @@ void MAKO::play_music(int page)
 			fm_mutex = SDL_CreateMutex();
 
 		SDL_LockMutex(fm_mutex);
-		free(fmdata);
-		fmdata = data;
-		fm = std::make_unique<MakoFMgen>(fmdata);
+		fm = std::make_unique<MakoFMgen>(data, true);
 		Mix_HookMusic(&FMHook, this);
 		SDL_UnlockMutex(fm_mutex);
 	} else {