diff --git a/media/libstagefright/MPEG4Writer.cpp b/media/libstagefright/MPEG4Writer.cpp
index 8f7d4bf..d99596e 100644
--- a/media/libstagefright/MPEG4Writer.cpp
+++ b/media/libstagefright/MPEG4Writer.cpp
@@ -2774,7 +2774,7 @@
         // even if the file is well-formed and the primary picture is correct.
 
         // Reserve item ids for samples + grid
-        size_t numItemsToReserve = mNumTiles + (mNumTiles > 1);
+        size_t numItemsToReserve = mNumTiles + (mNumTiles > 0);
         status_t err = mOwner->reserveItemId_l(numItemsToReserve, &mItemIdBase);
         if (err != OK) {
             return err;