diff --git a/lib/mp4.cpp b/lib/mp4.cpp
index 8712c442..5b49447c 100644
--- a/lib/mp4.cpp
+++ b/lib/mp4.cpp
@@ -3972,7 +3972,6 @@ namespace MP4 {
   
   void STCO::setChunkOffset(uint32_t newChunkOffset, uint32_t no){
     if (no + 1 > getEntryCount()){
-      setEntryCount(no+1);
       for (int i = getEntryCount(); i < no; i++){
         setInt32(0, 8 + i * 4);//filling undefined entries
       }