diff --git a/randomwallpaper@iflow.space/prefs.js b/randomwallpaper@iflow.space/prefs.js
index 7a924bf..d839d13 100644
--- a/randomwallpaper@iflow.space/prefs.js
+++ b/randomwallpaper@iflow.space/prefs.js
@@ -224,6 +224,10 @@ const RandomWallpaperSettings = new Lang.Class({
 			this._builder.get_object('generic-json-response-path'),
 			'text',
 			Gio.SettingsBindFlags.DEFAULT);
+		this._generic_json_settings.bind('generic-json-url-prefix',
+			this._builder.get_object('generic-json-url-prefix'),
+			'text',
+			Gio.SettingsBindFlags.DEFAULT);
 	}
 
 });
diff --git a/randomwallpaper@iflow.space/schemas/gschemas.compiled b/randomwallpaper@iflow.space/schemas/gschemas.compiled
index 9fc7997..8623855 100644
Binary files a/randomwallpaper@iflow.space/schemas/gschemas.compiled and b/randomwallpaper@iflow.space/schemas/gschemas.compiled differ
diff --git a/randomwallpaper@iflow.space/schemas/org.gnome.shell.extensions.space.iflow.randomwallpaper.gschema.xml b/randomwallpaper@iflow.space/schemas/org.gnome.shell.extensions.space.iflow.randomwallpaper.gschema.xml
index d80a074..86d4705 100644
--- a/randomwallpaper@iflow.space/schemas/org.gnome.shell.extensions.space.iflow.randomwallpaper.gschema.xml
+++ b/randomwallpaper@iflow.space/schemas/org.gnome.shell.extensions.space.iflow.randomwallpaper.gschema.xml
@@ -160,6 +160,11 @@
             <summary>JSON Path</summary>
             <description>The JSON path that describes the picture URL.</description>
         </key>
+        <key type='s' name='generic-json-url-prefix'>
+            <default>""</default>
+            <summary>Image URL prefix</summary>
+            <description>This prefix is added to the final image URL.</description>
+        </key>
     </schema>
 
 </schemalist>
diff --git a/randomwallpaper@iflow.space/settings.ui b/randomwallpaper@iflow.space/settings.ui
index 8c54bd8..2134cbd 100644
--- a/randomwallpaper@iflow.space/settings.ui
+++ b/randomwallpaper@iflow.space/settings.ui
@@ -153,6 +153,43 @@ You have to specify an URL to a JSON response and a path to the target picture u
         <property name="position">3</property>
       </packing>
     </child>
+    <child>
+      <object class="GtkBox">
+        <property name="visible">True</property>
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <child>
+          <object class="GtkLabel">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="halign">start</property>
+            <property name="label" translatable="yes">Image URL prefix</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <object class="GtkEntry" id="generic-json-url-prefix">
+            <property name="visible">True</property>
+            <property name="can_focus">True</property>
+            <property name="placeholder_text" translatable="yes">Image URL prefix</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="position">1</property>
+          </packing>
+        </child>
+      </object>
+      <packing>
+        <property name="expand">False</property>
+        <property name="fill">True</property>
+        <property name="position">4</property>
+      </packing>
+    </child>
   </object>
   <object class="GtkAdjustment" id="history-length">
     <property name="lower">1</property>
diff --git a/randomwallpaper@iflow.space/sourceAdapter.js b/randomwallpaper@iflow.space/sourceAdapter.js
index 684482c..6b80657 100644
--- a/randomwallpaper@iflow.space/sourceAdapter.js
+++ b/randomwallpaper@iflow.space/sourceAdapter.js
@@ -296,6 +296,7 @@ let GenericJsonAdapter = new Lang.Class({
 			let response = JSON.parse(message.response_body.data);
 			let JSONPath = this._settings.get("generic-json-response-path", "string");
 			let imageUrl = this._jsonPathParser.access(response, JSONPath);
+			imageUrl = this._settings.get("generic-json-url-prefix", "string")+imageUrl;
 
 			if (callback) {
 				let historyEntry = new HistoryModule.HistoryEntry(null, 'Generic JSON Source', imageUrl);