diff --git a/tests/tools/tool-file.c b/tests/tools/tool-file.c
index 2654378..5d84a0d 100644
--- a/tests/tools/tool-file.c
+++ b/tests/tools/tool-file.c
@@ -63,7 +63,7 @@ int cosms_core_tool_file_generate_delete_file(void) {
 
     fclose(file);
 
-    fopen_s(&file, LARGE_DELETE_FILE_PATH, "wb");
+    file = fopen(LARGE_DELETE_FILE_PATH, "wb");
     if (file == NULL) {
         return -1;
     }