2 files changed, 17 insertions, 3 deletions

diff --git a/engines/pegasus/timers.cpp b/engines/pegasus/timers.cpp
index 8ca7de98bf..584ddfbfe4 100755
--- a/engines/pegasus/timers.cpp
+++ b/engines/pegasus/timers.cpp
@@ -230,16 +230,25 @@ void TimeBase::checkCallBacks() {
 
 	// Check if we've triggered any callbacks
 	for (TimeBaseCallBack *runner = _callBackList; runner != 0; runner = runner->_nextCallBack) {
+		if (runner->_hasBeenTriggered)
+			continue;
+
 		if (runner->_type == kCallBackAtTime && runner->_trigger == kTriggerTimeFwd) {
-			if (getTime() >= (runner->_param2 * _preferredScale / runner->_param3) && getRate() > 0)
+			if (getTime() >= (runner->_param2 * _preferredScale / runner->_param3) && getRate() > 0) {
 				runner->callBack();
+				runner->_hasBeenTriggered = true;
+			}
 		} else if (runner->_type == kCallBackAtExtremes) {
 			if (runner->_trigger == kTriggerAtStop) {
-				if (time == stopTime)
+				if (time == stopTime) {
 					runner->callBack();
+					runner->_hasBeenTriggered = true;
+				}
 			} else if (runner->_trigger == kTriggerAtStart) {
-				if (time == startTime)
+				if (time == startTime) {
 					runner->callBack();
+					runner->_hasBeenTriggered = true;
+				}
 			}
 		}
 	}
@@ -292,6 +301,7 @@ TimeBaseCallBack::TimeBaseCallBack() {
 	_nextCallBack = 0;
 	_trigger = kTriggerNone;
 	_type = kCallBackNone;
+	_hasBeenTriggered = false;
 }
 
 TimeBaseCallBack::~TimeBaseCallBack() {
@@ -313,6 +323,7 @@ void TimeBaseCallBack::releaseCallBack() {
 
 void TimeBaseCallBack::disposeCallBack() {
 	_timeBase = 0;
+	_hasBeenTriggered = false;
 }
 
 void TimeBaseCallBack::scheduleCallBack(CallBackTrigger trigger, uint32 param2, uint32 param3) {
@@ -320,10 +331,12 @@ void TimeBaseCallBack::scheduleCallBack(CallBackTrigger trigger, uint32 param2,
 	_trigger = trigger;
 	_param2 = param2;
 	_param3 = param3;
+	_hasBeenTriggered = false;
 }
 
 void TimeBaseCallBack::cancelCallBack() {
 	_trigger = kTriggerNone;
+	_hasBeenTriggered = false;
 }
 
 IdlerTimeBase::IdlerTimeBase() {
diff --git a/engines/pegasus/timers.h b/engines/pegasus/timers.h
index 65e7d21372..0b2f59d6c7 100755
--- a/engines/pegasus/timers.h
+++ b/engines/pegasus/timers.h
@@ -172,6 +172,7 @@ protected:
 	CallBackType _type;
 	CallBackTrigger _trigger;
 	uint32 _param2, _param3;
+	bool _hasBeenTriggered;
 
 private:
 	void disposeCallBack();