diff --git a/bin/phantomas.js b/bin/phantomas.js
index ce39d9fe8..807de17c1 100755
--- a/bin/phantomas.js
+++ b/bin/phantomas.js
@@ -10,6 +10,7 @@
 "use strict";
 
 const { program } = require("commander"),
+  { decamelizeOptions } = require("./utils"),
   phantomas = require(".."),
   debug = require("debug")("phantomas:cli");
 
@@ -157,7 +158,9 @@ program
 
 // parse it
 program.parse(process.argv);
-var options = program.opts();
+
+// make sure options are not "camelCased" but "have-dashes" instead (issue #863)
+var options = decamelizeOptions(program.opts());
 
 debug("argv: %j", process.argv);
 debug("opts: %j", options);
diff --git a/bin/utils.js b/bin/utils.js
new file mode 100644
index 000000000..fd7d82efa
--- /dev/null
+++ b/bin/utils.js
@@ -0,0 +1,16 @@
+const decamelize = require("decamelize");
+
+function decamelizeOptions(options) {
+  // decamelize option names as returned by commander (see issue #863)
+  let decamelized = {};
+
+  for (const [key, value] of Object.entries(options)) {
+    decamelized[decamelize(key, { separator: "-" })] = value;
+  }
+
+  return decamelized;
+}
+
+module.exports = {
+  decamelizeOptions,
+};
diff --git a/package-lock.json b/package-lock.json
index 962d91624..d4155491d 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -616,10 +616,9 @@
       }
     },
     "decamelize": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
-      "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
-      "optional": true
+      "version": "5.0.0",
+      "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-5.0.0.tgz",
+      "integrity": "sha512-U75DcT5hrio3KNtvdULAWnLiAPbFUC4191ldxMmj4FA/mRuBnmDwU0boNfPyFRhnan+Jm+haLeSn3P0afcBn4w=="
     },
     "decode-uri-component": {
       "version": "0.2.0",
@@ -1560,6 +1559,14 @@
         "read-pkg-up": "^1.0.1",
         "redent": "^1.0.0",
         "trim-newlines": "^1.0.0"
+      },
+      "dependencies": {
+        "decamelize": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+          "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+          "optional": true
+        }
       }
     },
     "mime-db": {
@@ -2907,6 +2914,12 @@
           "resolved": "https://registry.npmjs.org/camelcase/-/camelcase-5.3.1.tgz",
           "integrity": "sha512-L28STB170nwWS63UjtlEOE3dldQApaJXZkOI1uMFfzf3rRuPegHaHesyee+YxQ+W6SvRDQV6UrdOdRiR153wJg==",
           "optional": true
+        },
+        "decamelize": {
+          "version": "1.2.0",
+          "resolved": "https://registry.npmjs.org/decamelize/-/decamelize-1.2.0.tgz",
+          "integrity": "sha1-9lNNFRSCabIDUue+4m9QH5oZEpA=",
+          "optional": true
         }
       }
     },
diff --git a/package.json b/package.json
index de6a9e320..06d9969d1 100644
--- a/package.json
+++ b/package.json
@@ -35,6 +35,7 @@
     "commander": "^7.0.0",
     "csv-string": "^4.0.1",
     "debug": "^4.1.1",
+    "decamelize": "^5.0.0",
     "js-yaml": "^4.0.0",
     "node-statsd": "0.1.1",
     "puppeteer": "^8.0.0"
diff --git a/test/bin-utils-test.js b/test/bin-utils-test.js
new file mode 100644
index 000000000..b38f7e01c
--- /dev/null
+++ b/test/bin-utils-test.js
@@ -0,0 +1,26 @@
+/**
+ * Integration tests using server-start.sh script
+ */
+const vows = require("vows"),
+  assert = require("assert"),
+  { decamelizeOptions } = require("../bin/utils");
+
+vows
+  .describe("bin utils")
+  .addBatch({
+    decamelizeOptions: {
+      topic: function () {
+        return decamelizeOptions({
+          url: "http://foo.com",
+          userAgent: "foo/bar",
+        });
+      },
+      "should decamelize options": function (opts) {
+        assert.deepStrictEqual(opts, {
+          url: "http://foo.com",
+          "user-agent": "foo/bar",
+        });
+      },
+    },
+  })
+  .export(module);