diff --git a/.rubocop_todo.yml b/.rubocop_todo.yml
index 6bf427c24..a6c69a6b9 100644
--- a/.rubocop_todo.yml
+++ b/.rubocop_todo.yml
@@ -13,7 +13,7 @@ Metrics/AbcSize:
 # Offense count: 4
 # Configuration parameters: CountComments.
 Metrics/ClassLength:
-  Max: 234
+  Max: 235
 
 # Offense count: 17
 Metrics/CyclomaticComplexity:
diff --git a/lib/faraday/connection.rb b/lib/faraday/connection.rb
index 3776253ee..6318de585 100644
--- a/lib/faraday/connection.rb
+++ b/lib/faraday/connection.rb
@@ -522,6 +522,7 @@ def build_exclusive_url(url = nil, params = nil, params_encoder = nil)
         base = base.dup
         base.path = "#{base.path}/" # ensure trailing slash
       end
+      url = url && URI.parse(url.to_s).opaque ? url.to_s.gsub(':', '%3A') : url
       uri = url ? base + url : base
       if params
         uri.query = params.to_query(params_encoder || options.params_encoder)
diff --git a/spec/faraday/connection_spec.rb b/spec/faraday/connection_spec.rb
index 4f51f5682..5c7e3b60c 100644
--- a/spec/faraday/connection_spec.rb
+++ b/spec/faraday/connection_spec.rb
@@ -270,6 +270,29 @@
         expect(uri.to_s).to eq('http://sushi.com/sake/')
       end
     end
+
+    context 'with colon in path' do
+      let(:url) { 'http://service.com' }
+
+      it 'joins url to base when used absolute path' do
+        conn = Faraday.new(url: url)
+        uri = conn.build_exclusive_url('/service:search?limit=400')
+        expect(uri.to_s).to eq('http://service.com/service:search?limit=400')
+      end
+
+      it 'joins url to base when used relative path' do
+        conn = Faraday.new(url: url)
+        uri = conn.build_exclusive_url('service:search?limit=400')
+        expect(uri.to_s).to eq('http://service.com/service%3Asearch?limit=400')
+      end
+
+      it 'joins url to base when used with path prefix' do
+        conn = Faraday.new(url: url)
+        conn.path_prefix = '/api'
+        uri = conn.build_exclusive_url('service:search?limit=400')
+        expect(uri.to_s).to eq('http://service.com/api/service%3Asearch?limit=400')
+      end
+    end
   end
 
   describe '#build_url' do