diff --git a/lib/email/styles.rb b/lib/email/styles.rb
index 522c0431722..64a92900242 100644
--- a/lib/email/styles.rb
+++ b/lib/email/styles.rb
@@ -20,9 +20,15 @@ module Email
           img['style'] = "max-width: 694px;"
         end
 
+        # ensure all urls are absolute
         if img['src'] =~ /^\/[^\/]/
           img['src'] = "#{Discourse.base_url}#{img['src']}"
         end
+
+        # ensure no schemaless urls
+        if img['src'].starts_with?("//")
+          img['src'] = "http:" + img['src']
+        end
       end
     end
 
@@ -42,9 +48,7 @@ module Email
       reset_tables
     end
 
-
     def format_html
-
       style('h3', 'margin: 15px 0 20px 0; border-bottom: 1px solid #ddd;')
       style('hr', 'background-color: #ddd; height: 1px; border: 1px;')
       style('a',' text-decoration: none; font-weight: bold; color: #006699;')
@@ -58,7 +62,6 @@ module Email
         pre.replace(pre.text)
       end
 
-
     end
 
     def to_html
diff --git a/spec/components/email/styles_spec.rb b/spec/components/email/styles_spec.rb
index b3f22186145..9ba4e66d166 100644
--- a/spec/components/email/styles_spec.rb
+++ b/spec/components/email/styles_spec.rb
@@ -40,9 +40,9 @@ describe Email::Styles do
       expect(frag.at("img")["src"]).to eq("#{Discourse.base_url}/some-image.png")
     end
 
-    it "it does not change protocol relative paths" do
+    it "prefixes schemaless image urls with http:" do
       frag = basic_fragment("<img src='//www.discourse.com/some-image.gif'>")
-      expect(frag.at("img")["src"]).to eq("//www.discourse.com/some-image.gif")
+      expect(frag.at("img")["src"]).to eq("http://www.discourse.com/some-image.gif")
     end
 
     it "strips classes and ids" do