diff --git a/platform/chromium/manifest.json b/platform/chromium/manifest.json
index 47ed59354..f73403ac9 100644
--- a/platform/chromium/manifest.json
+++ b/platform/chromium/manifest.json
@@ -2,7 +2,7 @@
     "manifest_version": 2,
 
     "name": "uBlock Origin",
-    "version": "1.8.1",
+    "version": "1.8.1.1",
 
     "default_locale": "en",
     "description": "__MSG_extShortDesc__",
diff --git a/platform/opera/manifest.json b/platform/opera/manifest.json
index 7129f7c7d..89ed96035 100644
--- a/platform/opera/manifest.json
+++ b/platform/opera/manifest.json
@@ -2,7 +2,7 @@
     "manifest_version": 2,
 
     "name": "uBlock Origin",
-    "version": "1.8.1",
+    "version": "1.8.1.1",
 
     "default_locale": "en",
     "description": "__MSG_extShortDesc__",
diff --git a/tools/make-firefox-meta.py b/tools/make-firefox-meta.py
index 974e67394..75e3c97b3 100644
--- a/tools/make-firefox-meta.py
+++ b/tools/make-firefox-meta.py
@@ -2,6 +2,7 @@
 
 import os
 import json
+import re
 import sys
 from io import open
 from shutil import rmtree
@@ -75,8 +76,10 @@ with open(chromium_manifest, encoding='utf-8') as m:
 
 # https://developer.mozilla.org/en-US/Add-ons/AMO/Policy/Maintenance#How_do_I_submit_a_Beta_add-on.3F
 # "To create a beta channel [...] '(a|alpha|b|beta|pre|rc)\d*$' "
-if sys.argv[2]:
-    manifest['version'] += sys.argv[2]
+
+match = re.search('^(\d+\.\d+\.\d+)(\.\d+)$', manifest['version'])
+if match:
+    manifest['version'] = match.group(1) + 'b' + match.group(2)[1:]
 
 manifest['homepage'] = 'https://github.com/gorhill/uBlock'
 manifest['description'] = descriptions['en']
diff --git a/tools/make-firefox.sh b/tools/make-firefox.sh
index fa43e3f1e..7d4c3c5ed 100755
--- a/tools/make-firefox.sh
+++ b/tools/make-firefox.sh
@@ -32,7 +32,7 @@ cp    platform/firefox/*.xul            $DES/
 cp    LICENSE.txt                       $DES/
 
 echo "*** uBlock0.firefox: Generating meta..."
-python tools/make-firefox-meta.py $DES/ "$2"
+python tools/make-firefox-meta.py $DES/
 
 if [ "$1" = all ]; then
     set +v