diff --git a/src/classic.c b/src/classic.c
index e08a4ad..d54acd9 100644
--- a/src/classic.c
+++ b/src/classic.c
@@ -76,7 +76,7 @@ int classic_ctrl_handshake(struct wiimote_t* wm, struct classic_ctrl_t* cc, byte
 		 */
 		if (data[offset + 16] == 0xFF) {
 			/* get the calibration data */
-			byte* handshake_buf = malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
+			byte* handshake_buf = (byte *)malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
 
 			WIIUSE_DEBUG("Classic controller handshake appears invalid, trying again.");
 			wiiuse_read_data_cb(wm, handshake_expansion, handshake_buf, WM_EXP_MEM_CALIBR, EXP_HANDSHAKE_LEN);
diff --git a/src/events.c b/src/events.c
index 8ed2230..7ff0b21 100644
--- a/src/events.c
+++ b/src/events.c
@@ -682,7 +682,7 @@ void handshake_expansion(struct wiimote_t* wm, byte* data, uint16_t len) {
 		wiiuse_write_data(wm, WM_EXP_MEM_ENABLE, &buf, 1);
 
 		/* get the calibration data */
-		handshake_buf = malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
+		handshake_buf = (byte *)malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
 		wiiuse_read_data_cb(wm, handshake_expansion, handshake_buf, WM_EXP_MEM_CALIBR, EXP_HANDSHAKE_LEN);
 
 		/* tell the wiimote to send expansion data */
diff --git a/src/nunchuk.c b/src/nunchuk.c
index b8471bd..4fbeedf 100644
--- a/src/nunchuk.c
+++ b/src/nunchuk.c
@@ -80,7 +80,7 @@ int nunchuk_handshake(struct wiimote_t* wm, struct nunchuk_t* nc, byte* data, un
 		 */
 		if (data[offset + 16] == 0xFF) {
 			/* get the calibration data */
-			byte* handshake_buf = malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
+			byte* handshake_buf = (byte *)malloc(EXP_HANDSHAKE_LEN * sizeof(byte));
 
 			WIIUSE_DEBUG("Nunchuk handshake appears invalid, trying again.");
 			wiiuse_read_data_cb(wm, handshake_expansion, handshake_buf, WM_EXP_MEM_CALIBR, EXP_HANDSHAKE_LEN);