diff --git a/scripts/assemble.py b/scripts/assemble.py
index 92623c4..30adcba 100755
--- a/scripts/assemble.py
+++ b/scripts/assemble.py
@@ -5,6 +5,7 @@
 """
 
 import argparse
+import errno
 import io
 import re
 import os.path
@@ -25,7 +26,11 @@
 class Assembly():
     def __init__(self, output, bootdir):
         self.find_slots(bootdir)
-        os.unlink(output)
+        try:
+            os.unlink(output)
+        except OSError as e:
+            if e.errno != errno.ENOENT:
+                raise
         self.output = output
 
     def find_slots(self, bootdir):