diff --git a/src/ints/mouse.cpp b/src/ints/mouse.cpp
index c312fb5e..b463a60f 100644
--- a/src/ints/mouse.cpp
+++ b/src/ints/mouse.cpp
@@ -525,18 +525,21 @@ void Mouse_ButtonPressed(Bit8u button) {
 	switch (button) {
 #if (MOUSE_BUTTONS >= 1)
 	case 0:
+		if (mouse.buttons&1) return;
 		mouse.buttons|=1;
 		Mouse_AddEvent(MOUSE_LEFT_PRESSED);
 		break;
 #endif
 #if (MOUSE_BUTTONS >= 2)
 	case 1:
+		if (mouse.buttons&2) return;
 		mouse.buttons|=2;
 		Mouse_AddEvent(MOUSE_RIGHT_PRESSED);
 		break;
 #endif
 #if (MOUSE_BUTTONS >= 3)
 	case 2:
+		if (mouse.buttons&4) return;
 		mouse.buttons|=4;
 		Mouse_AddEvent(MOUSE_MIDDLE_PRESSED);
 		break;
@@ -553,18 +556,21 @@ void Mouse_ButtonReleased(Bit8u button) {
 	switch (button) {
 #if (MOUSE_BUTTONS >= 1)
 	case 0:
+		if (!(mouse.buttons&1)) return;
 		mouse.buttons&=~1;
 		Mouse_AddEvent(MOUSE_LEFT_RELEASED);
 		break;
 #endif
 #if (MOUSE_BUTTONS >= 2)
 	case 1:
+		if (!(mouse.buttons&2)) return;
 		mouse.buttons&=~2;
 		Mouse_AddEvent(MOUSE_RIGHT_RELEASED);
 		break;
 #endif
 #if (MOUSE_BUTTONS >= 3)
 	case 2:
+		if (!(mouse.buttons&4)) return;
 		mouse.buttons&=~4;
 		Mouse_AddEvent(MOUSE_MIDDLE_RELEASED);
 		break;
@@ -698,6 +704,8 @@ static void Mouse_Reset(void) {
 	mouse.mickey_x = 0;
 	mouse.mickey_y = 0;
 
+	mouse.buttons = 0;
+
 	for (Bit16u but=0; but<MOUSE_BUTTONS; but++) {
 		mouse.times_pressed[but] = 0;
 		mouse.times_released[but] = 0;