diff --git a/internal/builtin/content_table.go b/internal/builtin/content_table.go
index 525d28b2..50e903a0 100644
--- a/internal/builtin/content_table.go
+++ b/internal/builtin/content_table.go
@@ -135,7 +135,7 @@ func renderTableContent(headers, values []tableCellTmpl, datactx plugin.MapData)
 	buf.WriteByte('\n')
 	buf.WriteByte('|')
 	for range hstr {
-		buf.WriteString("-")
+		buf.WriteString("---")
 		buf.WriteByte('|')
 	}
 	buf.WriteByte('\n')
diff --git a/internal/builtin/content_table_test.go b/internal/builtin/content_table_test.go
index 59d2de32..8e7f72de 100644
--- a/internal/builtin/content_table_test.go
+++ b/internal/builtin/content_table_test.go
@@ -58,7 +58,7 @@ func (s *TableGeneratorTestSuite) TestNilQueryResult() {
 		},
 	})
 	s.Equal(&plugin.Content{
-		Markdown: "|User Name|User Age|\n|-|-|\n",
+		Markdown: "|User Name|User Age|\n|---|---|\n",
 	}, content)
 	s.Nil(diags)
 }
@@ -85,7 +85,7 @@ func (s *TableGeneratorTestSuite) TestEmptyQueryResult() {
 		},
 	})
 	s.Equal(&plugin.Content{
-		Markdown: "|User Name|User Age|\n|-|-|\n",
+		Markdown: "|User Name|User Age|\n|---|---|\n",
 	}, content)
 	s.Nil(diags)
 }
@@ -121,7 +121,7 @@ func (s *TableGeneratorTestSuite) TestBasic() {
 		},
 	})
 	s.Equal(&plugin.Content{
-		Markdown: "|User Name|User Age|\n|-|-|\n|John|42|\n|Jane|43|\n",
+		Markdown: "|User Name|User Age|\n|---|---|\n|John|42|\n|Jane|43|\n",
 	}, content)
 	s.Nil(diags)
 }