diff --git a/scripts/unpisi b/scripts/unpisi
index 8d7bd128..38926574 100755
--- a/scripts/unpisi
+++ b/scripts/unpisi
@@ -34,6 +34,9 @@ def main():
     if len(sys.argv) < 2:
         usage("PiSi package required..")
 
+    elif not os.path.exists(sys.argv[1]):
+        usage("File %s not found" % sys.argv[1])
+
     try:
         arc = ArchiveZip(sys.argv[1], 'zip', 'r')
     except BadZipfile, e: