diff --git a/nx/include/switch/services/ncm.h b/nx/include/switch/services/ncm.h
index f8a43946..6ede7a05 100644
--- a/nx/include/switch/services/ncm.h
+++ b/nx/include/switch/services/ncm.h
@@ -170,7 +170,7 @@ Result ncmInvalidateRightsIdCache(void); ///< [9.0.0+]
 
 void ncmContentStorageClose(NcmContentStorage* cs);
 Result ncmContentStorageGeneratePlaceHolderId(NcmContentStorage* cs, NcmPlaceHolderId* out_id);
-Result ncmContentStorageCreatePlaceHolder(NcmContentStorage* cs, const NcmContentId* content_id, const NcmPlaceHolderId* placeholder_id, u64 size);
+Result ncmContentStorageCreatePlaceHolder(NcmContentStorage* cs, const NcmContentId* content_id, const NcmPlaceHolderId* placeholder_id, s64 size);
 Result ncmContentStorageDeletePlaceHolder(NcmContentStorage* cs, const NcmPlaceHolderId* placeholder_id);
 Result ncmContentStorageHasPlaceHolder(NcmContentStorage* cs, bool* out, const NcmPlaceHolderId* placeholder_id);
 Result ncmContentStorageWritePlaceHolder(NcmContentStorage* cs, const NcmPlaceHolderId* placeholder_id, u64 offset, const void* data, size_t data_size);
diff --git a/nx/source/services/ncm.c b/nx/source/services/ncm.c
index 5cde3647..e2d9649a 100644
--- a/nx/source/services/ncm.c
+++ b/nx/source/services/ncm.c
@@ -130,11 +130,11 @@ Result ncmContentStorageGeneratePlaceHolderId(NcmContentStorage* cs, NcmPlaceHol
     return _ncmCmdOutPlaceHolderId(&cs->s, out_id, 0);
 }
 
-Result ncmContentStorageCreatePlaceHolder(NcmContentStorage* cs, const NcmContentId* content_id, const NcmPlaceHolderId* placeholder_id, u64 size) {
+Result ncmContentStorageCreatePlaceHolder(NcmContentStorage* cs, const NcmContentId* content_id, const NcmPlaceHolderId* placeholder_id, s64 size) {
     const struct {
         NcmContentId content_id;
         NcmPlaceHolderId placeholder_id;
-        u64 size;
+        s64 size;
     } in = { *content_id, *placeholder_id, size };
     return serviceDispatchIn(&cs->s, 1, in);
 }