diff --git a/mpeg/mpegfile.cpp b/mpeg/mpegfile.cpp
index a825ad08..46c6c605 100644
--- a/mpeg/mpegfile.cpp
+++ b/mpeg/mpegfile.cpp
@@ -452,7 +452,7 @@ long MPEG::File::nextFrameOffset(long position)
     seek(position);
     buffer = readBlock(bufferSize());
 
-    for(uint i = 0; i < buffer.size(); i++) {
+    for(uint i = 0; i < buffer.size() - 1; i++) {
       if(uchar(buffer[i]) == 0xff && secondSynchByte(buffer[i + 1]))
     	return position + i;
     }