diff --git a/src/sound_aiff.c b/src/sound_aiff.c
index f7aecde..e481c73 100644
--- a/src/sound_aiff.c
+++ b/src/sound_aiff.c
@@ -108,7 +108,7 @@ static int init(struct options *options)
 static void play(void *b, int len) 
 {
 	if (swap_endian && bits == 16) {
-		convert_endian(b, len);
+		convert_endian((unsigned char *)b, len);
 	}
 	fwrite(b, 1, len, fd);
 	size += len;
diff --git a/src/sound_alsa05.c b/src/sound_alsa05.c
index 36b9ccf..ab255ee 100644
--- a/src/sound_alsa05.c
+++ b/src/sound_alsa05.c
@@ -106,7 +106,7 @@ static int init(struct options *options)
 	//  dev = snd_defaults_pcm_device(); /* ? */
 	parm_end();
 
-	mybuffer = malloc(frag_size);
+	mybuffer = (char*)malloc(frag_size);
 	if (mybuffer) {
 		mybuffer_nextfree = mybuffer;
 	} else {
diff --git a/src/sound_file.c b/src/sound_file.c
index 4747284..83b5730 100644
--- a/src/sound_file.c
+++ b/src/sound_file.c
@@ -41,7 +41,7 @@ static int init(struct options *options)
 	if (strcmp(options->out_file, "-")) {
 		int len = strlen(sound_file.description) +
 				strlen(options->out_file) + 8;
-		if ((buf = malloc(len)) == NULL)
+		if ((buf = (char *)malloc(len)) == NULL)
 			return -1;
 		snprintf(buf, len, "%s: %s", sound_file.description,
 						options->out_file);
@@ -56,7 +56,7 @@ static int init(struct options *options)
 static void play(void *b, int len)
 {
 	if (swap_endian) {
-		convert_endian(b, len);
+		convert_endian((unsigned char *)b, len);
 	}
 	fwrite(b, 1, len, fd);
 	size += len;
diff --git a/src/sound_sb.c b/src/sound_sb.c
index 91b1cc6..ad326dd 100644
--- a/src/sound_sb.c
+++ b/src/sound_sb.c
@@ -130,7 +130,7 @@ static void deinit(void)
 static void play(void *data, int siz) {
 	int i;
 	for (;;) {
-		i = write_sb_output(data, siz);
+		i = write_sb_output((char *)data, siz);
 		if ((siz -= i) <= 0) return;
 		data = (char *)data + i;
 		/*delay_ms(1);*/
diff --git a/src/sound_wav.c b/src/sound_wav.c
index eceda07..f9cb1dc 100644
--- a/src/sound_wav.c
+++ b/src/sound_wav.c
@@ -68,7 +68,7 @@ static int init(struct options *options)
 	if (strcmp(options->out_file, "-")) {
 		int len = strlen(sound_wav.description) +
 				strlen(options->out_file) + 8;
-		if ((buf = malloc(len)) == NULL)
+		if ((buf = (char *)malloc(len)) == NULL)
 			return -1;
 		snprintf(buf, len, "%s: %s", sound_wav.description,
 						options->out_file);
@@ -117,7 +117,7 @@ static int init(struct options *options)
 static void play(void *b, int len)
 {
 	if (swap_endian && format_16bit) {
-		convert_endian(b, len);
+		convert_endian((unsigned char *)b, len);
 	}
 	fwrite(b, 1, len, fd);
 	size += len;
diff --git a/src/sound_win32.c b/src/sound_win32.c
index 611ea6f..0b0cbbb 100644
--- a/src/sound_win32.c
+++ b/src/sound_win32.c
@@ -109,7 +109,7 @@ static int init(struct options *options)
 	waveOutReset(hwaveout);
 
 	for (i = 0; i < num_buffers; i++) {
-		buffer[i] = malloc(OUT_MAXLEN);
+		buffer[i] = (LPSTR) malloc(OUT_MAXLEN);
 		header[i].lpData = buffer[i];
 
 		if (!buffer[i] || res != MMSYSERR_NOERROR) {