diff --git a/manifests/init.pp b/manifests/init.pp
index b6941187..a3636891 100644
--- a/manifests/init.pp
+++ b/manifests/init.pp
@@ -632,6 +632,17 @@ class horizon(
     include horizon::dashboards::heat
   }
 
+  # TODO(tkajinam): Remove this logic after Yoga cycle.
+  if $horizon_upload_mode != undef {
+    $horizon_upload_mode_real = regsubst($horizon_upload_mode, "('|\")", '', 'G')
+    if $horizon_upload_mode != $horizon_upload_mode_real {
+      warning('The horizon_upload_mode parameter is now quoted automatically, \
+and usage of a quoted value is deprecated.')
+    }
+  } else {
+    $horizon_upload_mode_real = undef
+  }
+
   if $cache_server_url and $cache_server_ip {
     fail('Only one of cache_server_url or cache_server_ip can be set.')
   }
diff --git a/releasenotes/notes/fix_missing_quotes_for_images_upload-bcd649d0311afe32.yaml b/releasenotes/notes/fix_missing_quotes_for_images_upload-bcd649d0311afe32.yaml
new file mode 100644
index 00000000..e82adc3f
--- /dev/null
+++ b/releasenotes/notes/fix_missing_quotes_for_images_upload-bcd649d0311afe32.yaml
@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fix HORIZON_IMAGES_UPLOAD_MODE in template file because the value must be
+    encapsulated with quotes or it will be treated as an expression by horizon.
diff --git a/spec/classes/horizon_init_spec.rb b/spec/classes/horizon_init_spec.rb
index 1c9c6de7..77bec752 100644
--- a/spec/classes/horizon_init_spec.rb
+++ b/spec/classes/horizon_init_spec.rb
@@ -694,7 +694,20 @@ describe 'horizon' do
       end
       it 'sets HORIZON_IMAGES_UPLOAD_MODE in local_settings.py' do
         verify_concat_fragment_contents(catalogue, 'local_settings.py', [
-	  'HORIZON_IMAGES_UPLOAD_MODE = direct',
+          'HORIZON_IMAGES_UPLOAD_MODE = "direct"',
+        ])
+      end
+    end
+
+    context 'with upload mode with quotes' do
+      before do
+        params.merge!({
+          :horizon_upload_mode  => '"direct"',
+        })
+      end
+      it 'sets HORIZON_IMAGES_UPLOAD_MODE in local_settings.py' do
+        verify_concat_fragment_contents(catalogue, 'local_settings.py', [
+          'HORIZON_IMAGES_UPLOAD_MODE = "direct"',
         ])
       end
     end
diff --git a/templates/local_settings.py.erb b/templates/local_settings.py.erb
index 50b216e4..037abf9e 100644
--- a/templates/local_settings.py.erb
+++ b/templates/local_settings.py.erb
@@ -1038,6 +1038,6 @@ REST_API_REQUIRED_SETTINGS = ['OPENSTACK_HYPERVISOR_FEATURES',
 #DISALLOW_IFRAME_EMBED = True
 DISALLOW_IFRAME_EMBED = <%= @disallow_iframe_embed.to_s.capitalize %>
 
-<% if @horizon_upload_mode %>
-HORIZON_IMAGES_UPLOAD_MODE = <%= @horizon_upload_mode %>
+<% if @horizon_upload_mode_real %>
+HORIZON_IMAGES_UPLOAD_MODE = "<%= @horizon_upload_mode_real %>"
 <% end %>