diff --git a/storage/filesystem/fat/source/FATFileSystem.cpp b/storage/filesystem/fat/source/FATFileSystem.cpp
index 3006a24..98fa2a5 100644
--- a/storage/filesystem/fat/source/FATFileSystem.cpp
+++ b/storage/filesystem/fat/source/FATFileSystem.cpp
@@ -755,6 +755,7 @@
         return fat_error_remap(res);
     }
 
+    unlock();
     return 0;
 }