diff --git a/lib/workers/pr/pr-body.js b/lib/workers/pr/pr-body.js
index cdb7195daf565b0e8ceb6bb8b6714f42f8944a38..ad164a4bcf5e6e7a670ead0b168f5198c8976ec2 100644
--- a/lib/workers/pr/pr-body.js
+++ b/lib/workers/pr/pr-body.js
@@ -85,7 +85,7 @@ async function getPrBody(config) {
   }
   prBody += '\n\nThis PR contains the following updates:\n\n';
   prBody += '| ' + tableColumns.join(' | ') + ' |\n';
-  prBody += '|' + tableColumns.map(() => '--|').join('') + '\n';
+  prBody += '|' + tableColumns.map(() => '---|').join('') + '\n';
   const rows = [];
   for (const row of tableValues) {
     let val = '|';
diff --git a/test/workers/pr/__snapshots__/index.spec.js.snap b/test/workers/pr/__snapshots__/index.spec.js.snap
index 32b395821dc6c4833f204dc1f89835e2d019ab42..64120872f886047a22333fa65b5481cbfefcee1f 100644
--- a/test/workers/pr/__snapshots__/index.spec.js.snap
+++ b/test/workers/pr/__snapshots__/index.spec.js.snap
@@ -31,7 +31,7 @@ Array [
   "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | pin | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 
 :pushpin: **Important**: Renovate will wait until you have merged this Pin PR before creating any *upgrade* PRs for the affected packages. Add the preset \`:preserveSemverRanges\` your config if you instead don't wish to pin dependencies.
@@ -73,7 +73,7 @@ Array [
   "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | minor | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 
 ---
@@ -113,7 +113,7 @@ Array [
   "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | lockFileMaintenance | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 | a |  |  | aaaaaaa |  |
 | b |  | pin |  |  |
@@ -170,7 +170,7 @@ Array [
   "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | minor | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 
 ---
@@ -208,7 +208,7 @@ Object {
   "body": "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | minor | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 
 ---
@@ -246,7 +246,7 @@ Object {
   "body": "This PR contains the following updates:
 
 | Package | Type | Update | New value | References |
-|--|--|--|--|--|
+|---|---|---|---|---|
 | dummy | devDependencies | minor | 1.1.0 | [homepage](https://dummy.com), [source](https://github.com/renovateapp/dummy), [changelog](https://github.com/renovateapp/dummy/changelog.md) |
 
 ---