diff --git a/headeredit.cpp b/headeredit.cpp
index 8c13cdb..5618a08 100644
--- a/headeredit.cpp
+++ b/headeredit.cpp
@@ -35,6 +35,6 @@ main()
   new_data[3] = (unsigned char) samples;
   printf("value: %#x\n", (unsigned char)samples);
   //memcpy(&new_data[0], &samples, sizeof(int));
-  memcpy(&new_data[4], &data[58], samples_old);
+  memcpy(&new_data[4], &data[old_header_size], samples_old);
   fwrite(&new_data[0], sizeof(unsigned char), samples_old+headersize, o);
 }
\ No newline at end of file