diff --git a/zaphod.py b/zaphod.py
index c8057fe..8b8dbb9 100644
--- a/zaphod.py
+++ b/zaphod.py
@@ -736,7 +736,7 @@ def setup(self):
                                       Default: ."
                                       )
         self.diff_parser.add_argument("-l", "--latexdiffopts",
-                                      default="'--type=UNDERLINE'",
+                                      default="--type=UNDERLINE",
                                       action="store",
                                       help="Pass options to latexdiff. \
                                       Please read man latexdiff for \