diff --git a/lib/perron/html_processor/absolute_urls.rb b/lib/perron/html_processor/absolute_urls.rb
index 6ce4c0f..40fe084 100644
--- a/lib/perron/html_processor/absolute_urls.rb
+++ b/lib/perron/html_processor/absolute_urls.rb
@@ -9,7 +9,7 @@ def process
 
           next if src.blank? || absolute_url?(src)
 
-          image["src"] = base_url + src
+          image["src"] = "#{base_url}/#{src.delete_prefix("/")}"
         end
       end
 
diff --git a/lib/perron/resource/metadata.rb b/lib/perron/resource/metadata.rb
index 4434734..5b7445b 100644
--- a/lib/perron/resource/metadata.rb
+++ b/lib/perron/resource/metadata.rb
@@ -71,7 +71,7 @@ def absolute_url(path)
         return path if path.blank?
         return path if path.start_with?("http://", "https://", "//")
 
-        Perron.configuration.url.delete_suffix("/") + path
+        "#{Perron.configuration.url.delete_suffix("/")}/#{path.delete_prefix("/")}"
       end
 
       def site_data
diff --git a/test/perron/html_processor/absolute_urls_test.rb b/test/perron/html_processor/absolute_urls_test.rb
index 3d8b4ef..85e8d83 100644
--- a/test/perron/html_processor/absolute_urls_test.rb
+++ b/test/perron/html_processor/absolute_urls_test.rb
@@ -60,4 +60,13 @@ def process_html(html)
 
     assert_dom_equal html, processed
   end
+
+  test 'inserts a slash for a relative src without a leading slash' do
+    html = '<img src="photo.jpg"><img src="nested/photo.jpg">'
+    processed = process_html(html)
+
+    assert_dom_equal '<img src="http://localhost:3000/photo.jpg">' \
+                     '<img src="http://localhost:3000/nested/photo.jpg">',
+                     processed
+  end
 end
diff --git a/test/perron/resource/metadata_test.rb b/test/perron/resource/metadata_test.rb
index a4093e7..db94fda 100644
--- a/test/perron/resource/metadata_test.rb
+++ b/test/perron/resource/metadata_test.rb
@@ -105,6 +105,17 @@ def setup
     assert_equal 'Kendall', metadata.author, 'Frontmatter author should take highest precedence'
   end
 
+  test 'makes a relative frontmatter image absolute with a slash separator' do
+    metadata = Perron::Resource::Metadata.new(
+      resource: @post,
+      frontmatter: { image: 'cover.jpg' },
+      collection: @posts_collection
+    ).data
+
+    assert_equal 'http://localhost:3000/cover.jpg', metadata.image
+    assert_equal 'http://localhost:3000/cover.jpg', metadata.og_image
+  end
+
   test 'removes nil values from final data after processing' do
     metadata = Perron::Resource::Metadata.new(
       resource: @about_page,