diff --git a/Main/src/Image.h b/Main/src/Image.h
index e8b1acb4..8768ca43 100644
--- a/Main/src/Image.h
+++ b/Main/src/Image.h
@@ -418,7 +418,7 @@
 			const TDecoderMethod method;
 			bool resetDecoderOnIndex;
 			DWORD iNextTime,nLogTimes;
-			TLogTime indexPulses[Revolution::MAX+1];
+			TLogTime indexPulses[Revolution::MAX+2]; // "+2" = "+1+1" = "+A+B", A = tail IndexPulse of last possible Revolution, B = terminator
 			BYTE iNextIndexPulse,nIndexPulses;
 			TProfile profile;
 			TLogTime currentTime;
diff --git a/Main/src/Image_TrackRW.cpp b/Main/src/Image_TrackRW.cpp
index 32881529..a0bbcd2a 100644
--- a/Main/src/Image_TrackRW.cpp
+++ b/Main/src/Image_TrackRW.cpp
@@ -1415,7 +1415,7 @@
 
 	void CImage::CTrackReaderWriter::AddIndexTime(TLogTime logTime){
 		// appends LogicalTime representing the position of the index pulse on the disk
-		ASSERT( nIndexPulses<Revolution::MAX );
+		ASSERT( nIndexPulses<=Revolution::MAX );
 		ASSERT( logTime>=0 );
 		indexPulses[nIndexPulses++]=logTime;
 		indexPulses[nIndexPulses]=INT_MAX;