diff --git a/arm9/source/utils/gameutil.c b/arm9/source/utils/gameutil.c
index 7aaf04a..1ea3f58 100644
--- a/arm9/source/utils/gameutil.c
+++ b/arm9/source/utils/gameutil.c
@@ -1609,13 +1609,14 @@ u32 BuildCiaFromNcsdFile(const char* path_ncsd, const char* path_cia) {
     
     // insert NCSD content
     TmdContentChunk* chunk = cia->content_list;
-    for (u32 i = 0; i < 3; i++) {
+    for (u32 i = 0, idx = 0; i < 3; i++) {
         NcchPartition* partition = ncsd.partitions + i;
         u32 offset = partition->offset * NCSD_MEDIA_UNIT;
         u32 size = partition->size * NCSD_MEDIA_UNIT;
         if (!size) continue;
         memset(chunk, 0, sizeof(TmdContentChunk));
-        chunk->id[3] = chunk->index[1] = i;
+        chunk->id[3] = i;
+        chunk->index[1] = idx++;
         if (InsertCiaContent(path_cia, path_ncsd, offset, size, chunk++, NULL, false, (i == 0), false) != 0) {
             free(cia);
             return 1;