diff --git a/bin/casperjs b/bin/casperjs
index 77cd749e4..34490230b 100755
--- a/bin/casperjs
+++ b/bin/casperjs
@@ -34,6 +34,7 @@ SUPPORTED_ENGINES = {
             'script-encoding',
             'ssl-protocol',
             'ssl-certificates-path',
+            'ssl-client-certificate-file',
             'web-security',
             'webdriver',
             'webdriver-logfile',
diff --git a/src/casperjs.cs b/src/casperjs.cs
index d1c4b163a..e8e059377 100755
--- a/src/casperjs.cs
+++ b/src/casperjs.cs
@@ -41,6 +41,7 @@ class phantomjs : engine {
             "script-encoding",
             "ssl-protocol",
             "ssl-certificates-path",
+            "ssl-client-certificate-file",
             "web-security",
             "webdriver",
             "webdriver-logfile",