diff --git a/tildes/alembic/versions/82e9801eb2d6_update_post_topic_permission_to_topic_.py b/tildes/alembic/versions/82e9801eb2d6_update_post_topic_permission_to_topic_.py
new file mode 100644
index 0000000..50f2e62
--- /dev/null
+++ b/tildes/alembic/versions/82e9801eb2d6_update_post_topic_permission_to_topic_.py
@@ -0,0 +1,28 @@
+"""Update post_topic permission to topic.post
+
+Revision ID: 82e9801eb2d6
+Revises: 0435c46f64d8
+Create Date: 2020-08-05 00:05:46.690188
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = "82e9801eb2d6"
+down_revision = "0435c46f64d8"
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.execute(
+        "update user_permissions set permission = 'topic.post' where permission = 'post_topic'"
+    )
+
+
+def downgrade():
+    op.execute(
+        "update user_permissions set permission = 'post_topic' where permission = 'topic.post'"
+    )
diff --git a/tildes/tildes/models/group/group.py b/tildes/tildes/models/group/group.py
index eedbc4c..dfa9cdc 100644
--- a/tildes/tildes/models/group/group.py
+++ b/tildes/tildes/models/group/group.py
@@ -124,15 +124,15 @@ class Group(DatabaseModel):
         #  - all groups can be subscribed to by logged-in users
         acl.append((Allow, Authenticated, "subscribe"))
 
-        # post_topic:
+        # topic.post:
         #  - only users with specifically-granted permission can post topics in groups
         #    that require permission to post
         #  - otherwise, all logged-in users can post
         if self.requires_permission_to_post_topics:
-            acl.append((Allow, f"{self.group_id}:post_topic", "post_topic"))
-            acl.append((Deny, Everyone, "post_topic"))
+            acl.append((Allow, f"{self.group_id}:topic.post", "topic.post"))
+            acl.append((Deny, Everyone, "topic.post"))
 
-        acl.append((Allow, Authenticated, "post_topic"))
+        acl.append((Allow, Authenticated, "topic.post"))
 
         # wiki_page_create:
         #  - requires being granted the "wiki.edit" permission
diff --git a/tildes/tildes/templates/search.jinja2 b/tildes/tildes/templates/search.jinja2
index 2cf2a85..721b0f9 100644
--- a/tildes/tildes/templates/search.jinja2
+++ b/tildes/tildes/templates/search.jinja2
@@ -36,7 +36,7 @@
   {% if request.user %}
     <div class="divider"></div>
 
-    {% if request.has_permission('post_topic', group) %}
+    {% if request.has_permission("topic.post", group) %}
       <a href="/~{{ group.path }}/new_topic" class="btn btn-primary">Post a new topic</a>
     {% endif %}
 
diff --git a/tildes/tildes/templates/topic_listing.jinja2 b/tildes/tildes/templates/topic_listing.jinja2
index d613fe3..f3b1b44 100644
--- a/tildes/tildes/templates/topic_listing.jinja2
+++ b/tildes/tildes/templates/topic_listing.jinja2
@@ -148,7 +148,7 @@
   <div class="empty">
     {% if period %}
       <h2 class="empty-title">No topics in the selected time period</h2>
-      {% if is_single_group and request.has_permission('post_topic', group) %}
+      {% if is_single_group and request.has_permission("topic.post", group) %}
         <p class="empty-subtitle">Try choosing a longer time period, or break the silence by posting one yourself.</p>
         <div class="empty-action">
           <a href="/~{{ group.path }}/new_topic" class="btn btn-primary">Post a new topic</a>
@@ -218,7 +218,7 @@
 
   {{ render_group_subscription_box(group) }}
 
-  {% if request.has_permission('post_topic', group) %}
+  {% if request.has_permission("topic.post", group) %}
     <a href="/~{{ group.path }}/new_topic" class="btn btn-primary">Post a new topic</a>
   {% endif %}
 
diff --git a/tildes/tildes/views/topic.py b/tildes/tildes/views/topic.py
index 715d5e0..faef389 100644
--- a/tildes/tildes/views/topic.py
+++ b/tildes/tildes/views/topic.py
@@ -45,7 +45,7 @@ from tildes.views.financials import get_financial_data
 DefaultSettings = namedtuple("DefaultSettings", ["order", "period"])
 
 
-@view_config(route_name="group_topics", request_method="POST", permission="post_topic")
+@view_config(route_name="group_topics", request_method="POST", permission="topic.post")
 @use_kwargs(TopicSchema(only=("title", "markdown", "link")), location="form")
 @use_kwargs(
     {"tags": String(missing=""), "confirm_repost": Boolean(missing=False)},
@@ -379,7 +379,7 @@ def get_search(
 
 
 @view_config(
-    route_name="new_topic", renderer="new_topic.jinja2", permission="post_topic"
+    route_name="new_topic", renderer="new_topic.jinja2", permission="topic.post"
 )
 def get_new_topic_form(request: Request) -> dict:
     """Form for entering a new topic to post."""