diff --git a/lib/libnx/include/nx/FacHeader.h b/lib/libnx/include/nx/FacHeader.h
index 55bcc7d..08ab345 100644
--- a/lib/libnx/include/nx/FacHeader.h
+++ b/lib/libnx/include/nx/FacHeader.h
@@ -56,10 +56,10 @@ namespace nx
 		void setFsaRightsList(const fnd::List<fac::FsAccessFlag>& list);
 
 		const sSection& getContentOwnerIdPos() const;
-		void setContentOwnerIdSize(size_t size);
+		void setContentOwnerIdPos(const sSection& pos);
 
 		const sSection& getSaveDataOwnerIdPos() const;;
-		void setSaveDataOwnerIdSize(size_t size);
+		void setSaveDataOwnerIdPos(const sSection& pos);
 
 	private:
 		const std::string kModuleName = "FAC_HEADER";
@@ -72,8 +72,6 @@ namespace nx
 		fnd::List<fac::FsAccessFlag> mFsaRights;
 		sSection mContentOwnerIdPos;
 		sSection mSaveDataOwnerIdPos;
-
-		void calculateOffsets();
 	};
 }
 
diff --git a/lib/libnx/source/FacBinary.cpp b/lib/libnx/source/FacBinary.cpp
index f2f68db..cf391af 100644
--- a/lib/libnx/source/FacBinary.cpp
+++ b/lib/libnx/source/FacBinary.cpp
@@ -42,22 +42,29 @@ void nx::FacBinary::toBytes()
 {
 	FacHeader hdr;
 
+	FacHeader::sSection content_id_list_pos, savedata_owner_id_list_pos;
+
+	content_id_list_pos.size = mContentOwnerIdList.size() * sizeof(uint32_t);
+	content_id_list_pos.offset = align(sizeof(sFacHeader), 4);
+	savedata_owner_id_list_pos.size = mSaveDataOwnerIdList.size() * sizeof(uint32_t);
+	savedata_owner_id_list_pos.offset = content_id_list_pos.offset + align(content_id_list_pos.size, 4);
+
 	hdr.setFormatVersion(fac::kFacFormatVersion);
 	hdr.setFsaRightsList(mFsaRights);
-	hdr.setContentOwnerIdSize(mContentOwnerIdList.size() * sizeof(uint32_t));
-	hdr.setSaveDataOwnerIdSize(mSaveDataOwnerIdList.size() * sizeof(uint32_t));
+	hdr.setContentOwnerIdPos(content_id_list_pos);
+	hdr.setSaveDataOwnerIdPos(savedata_owner_id_list_pos);
 	hdr.toBytes();
 
 	mRawBinary.alloc(hdr.getFacSize());
 	memcpy(mRawBinary.data(), hdr.getBytes().data(), hdr.getBytes().size());
 
-	uint32_t* rawContentOwnerIds = (uint32_t*)(mRawBinary.data() + hdr.getContentOwnerIdPos().offset);
+	uint32_t* rawContentOwnerIds = (uint32_t*)(mRawBinary.data() + content_id_list_pos.offset);
 	for (size_t i = 0; i < mContentOwnerIdList.size(); i++)
 	{
 		rawContentOwnerIds[i] = le_word(mContentOwnerIdList[i]);
 	}
 
-	uint32_t* rawSaveDataOwnerIds = (uint32_t*)(mRawBinary.data() + hdr.getSaveDataOwnerIdPos().offset);
+	uint32_t* rawSaveDataOwnerIds = (uint32_t*)(mRawBinary.data() + savedata_owner_id_list_pos.offset);
 	for (size_t i = 0; i < mSaveDataOwnerIdList.size(); i++)
 	{
 		rawSaveDataOwnerIds[i] = le_word(mSaveDataOwnerIdList[i]);
diff --git a/lib/libnx/source/FacHeader.cpp b/lib/libnx/source/FacHeader.cpp
index fc64958..d1a06b3 100644
--- a/lib/libnx/source/FacHeader.cpp
+++ b/lib/libnx/source/FacHeader.cpp
@@ -61,7 +61,6 @@ void nx::FacHeader::toBytes()
 	}
 	hdr->fac_flags = (flag);
 
-	calculateOffsets();
 	hdr->content_owner_ids.start = (uint32_t)(mContentOwnerIdPos.offset);
 	hdr->content_owner_ids.end = (uint32_t)(mContentOwnerIdPos.offset + mContentOwnerIdPos.size);
 	hdr->save_data_owner_ids.start = (uint32_t)(mSaveDataOwnerIdPos.offset);
@@ -151,9 +150,9 @@ const nx::FacHeader::sSection& nx::FacHeader::getContentOwnerIdPos() const
 	return mContentOwnerIdPos;
 }
 
-void nx::FacHeader::setContentOwnerIdSize(size_t size)
+void nx::FacHeader::setContentOwnerIdPos(const sSection& pos)
 {
-	mContentOwnerIdPos.size = size;
+	mContentOwnerIdPos = pos;
 }
 
 const nx::FacHeader::sSection& nx::FacHeader::getSaveDataOwnerIdPos() const
@@ -161,13 +160,7 @@ const nx::FacHeader::sSection& nx::FacHeader::getSaveDataOwnerIdPos() const
 	return mSaveDataOwnerIdPos;
 }
 
-void nx::FacHeader::setSaveDataOwnerIdSize(size_t size)
+void nx::FacHeader::setSaveDataOwnerIdPos(const sSection& pos)
 {
-	mSaveDataOwnerIdPos.size = size;
-}
-
-void nx::FacHeader::calculateOffsets()
-{
-	mContentOwnerIdPos.offset = align(sizeof(sFacHeader), 4);
-	mSaveDataOwnerIdPos.offset = mContentOwnerIdPos.offset + align(mContentOwnerIdPos.size, 4);
+	mSaveDataOwnerIdPos = pos;
 }
\ No newline at end of file