diff --git a/services/extension/tasks.py b/services/extension/tasks.py
index 398107e..d05f0e9 100644
--- a/services/extension/tasks.py
+++ b/services/extension/tasks.py
@@ -251,3 +251,24 @@ def build_firefox_source(ctx: Context):
             f'../firefox-source-{current_version}.zip',
             '.',
         ]))
+
+
+@task
+def build_opera_source(ctx: Context):
+    # AMO requires source bundle to be uploaded alongside the built version.
+    ctx.run('rm -rf dist/opera-source')
+    ctx.run('mkdir -p dist/opera-source dist/opera-source/assets dist/opera-source/src')
+
+    ctx.run('rsync -arv assets/ dist/opera-source/assets/')
+    ctx.run('rsync -arv src/ dist/opera-source/src/')
+    ctx.run('rsync -arv eslint.config.js package.json README.md rollup.config.js yarn.lock dist/opera-source/')
+
+    with ctx.cd('dist/opera-source'):
+        current_version = get_version(ctx)
+
+        ctx.run(' '.join([
+            'zip',
+            '-r',
+            f'../opera-source-{current_version}.zip',
+            '.',
+        ]))