diff --git a/repertory/librepertory/src/file_manager/open_file.cpp b/repertory/librepertory/src/file_manager/open_file.cpp
index 1f7f9937..1f278b45 100644
--- a/repertory/librepertory/src/file_manager/open_file.cpp
+++ b/repertory/librepertory/src/file_manager/open_file.cpp
@@ -129,7 +129,7 @@ auto open_file::adjust_cache_size(std::uint64_t file_size, bool shrink)
   }
 
   if (file_size > fsi_.size) {
-    auto size = file_size - file_size;
+    auto size = file_size - fsi_.size;
     auto res = shrink ? cache_size_mgr::instance().shrink(size)
                       : cache_size_mgr::instance().expand(size);
     if (res == api_error::success) {
@@ -143,7 +143,7 @@ auto open_file::adjust_cache_size(std::uint64_t file_size, bool shrink)
     return set_api_error(res);
   }
 
-  auto size = fsi_.size = file_size;
+  auto size = fsi_.size - file_size;
   auto res = shrink ? cache_size_mgr::instance().expand(size)
                     : cache_size_mgr::instance().shrink(size);
   if (res == api_error::success) {