diff --git a/tests/extmod/vfs_fat_more.py b/tests/extmod/vfs_fat_more.py
index baec96787b..ae340dde8f 100644
--- a/tests/extmod/vfs_fat_more.py
+++ b/tests/extmod/vfs_fat_more.py
@@ -114,3 +114,11 @@ uos.umount('/')
 print(uos.getcwd())
 print(uos.listdir())
 print(uos.listdir('sys'))
+
+# test importing a file from a mounted FS
+import sys
+sys.path.clear()
+sys.path.append('/sys')
+with open('sys/test_module.py', 'w') as f:
+    f.write('print("test_module!")')
+import test_module
diff --git a/tests/extmod/vfs_fat_more.py.exp b/tests/extmod/vfs_fat_more.py.exp
index aaca3cc75e..24429ee095 100644
--- a/tests/extmod/vfs_fat_more.py.exp
+++ b/tests/extmod/vfs_fat_more.py.exp
@@ -26,3 +26,4 @@ mkdir OSError True
 /
 ['sys']
 []
+test_module!