1 files changed, 4 insertions, 1 deletions

diff --git a/scripts/lib/wic/filemap.py b/scripts/lib/wic/filemap.py
index 244c07a71c..a3919fbcad 100644
--- a/scripts/lib/wic/filemap.py
+++ b/scripts/lib/wic/filemap.py
@@ -32,7 +32,10 @@ def get_block_size(file_obj):
     """
     # Get the block size of the host file-system for the image file by calling
     # the FIGETBSZ ioctl (number 2).
-    binary_data = fcntl.ioctl(file_obj, 2, struct.pack('I', 0))
+    try:
+        binary_data = fcntl.ioctl(file_obj, 2, struct.pack('I', 0))
+    except OSError:
+        raise IOError("Unable to determine block size")
     bsize = struct.unpack('I', binary_data)[0]
     if not bsize:
         import os