diff --git a/src/io.c b/src/io.c
index 9e8a749..82e9af7 100644
--- a/src/io.c
+++ b/src/io.c
@@ -205,7 +205,7 @@ void wiiuse_read_data_sync(struct wiimote_t *wm, byte memory, unsigned addr, uns
  *	with this data.
  */
 
-#ifndef WIIUSE_SYNC_HANDSHAKE
+#ifdef WIIUSE_SYNC_HANDSHAKE
 
 void wiiuse_handshake(struct wiimote_t* wm, byte* data, uint16_t len)
 {
diff --git a/src/wiiuse.c b/src/wiiuse.c
index b4b95db..839f0b6 100644
--- a/src/wiiuse.c
+++ b/src/wiiuse.c
@@ -181,7 +181,7 @@ void wiiuse_disconnected(struct wiimote_t* wm) {
 	wm->leds = 0;
 	wm->state = WIIMOTE_INIT_STATES;
 	wm->read_req = NULL;
-#ifdef WIIUSE_SYNC_HANDSHAKE
+#ifndef WIIUSE_SYNC_HANDSHAKE
 	wm->handshake_state = 0;
 #endif
 	wm->btns = 0;
@@ -763,7 +763,7 @@ void wiiuse_set_accel_threshold(struct wiimote_t* wm, int threshold) {
 void wiiuse_resync(struct wiimote_t* wm) {
 	if (!wm)	return;
 
-#ifdef WIIUSE_SYNC_HANDSHAKE
+#ifndef WIIUSE_SYNC_HANDSHAKE
 	wm->handshake_state = 0;
 #endif
 	wiiuse_handshake(wm, NULL, 0);
diff --git a/src/wiiuse.h b/src/wiiuse.h
index f801e3c..84affea 100644
--- a/src/wiiuse.h
+++ b/src/wiiuse.h
@@ -753,7 +753,7 @@ typedef struct wiimote_t {
 
 	WCONST int flags;						/**< options flag							*/
 
-#ifdef WIIUSE_SYNC_HANDSHAKE
+#ifndef WIIUSE_SYNC_HANDSHAKE
 	WCONST byte handshake_state;			/**< the state of the connection handshake	*/
 #endif
 	WCONST byte expansion_state;            /**< the state of the expansion handshake	*/