diff --git a/packages/plugin-ext/src/plugin/webviews.ts b/packages/plugin-ext/src/plugin/webviews.ts
index bef85108ebbea..7611998af941f 100644
--- a/packages/plugin-ext/src/plugin/webviews.ts
+++ b/packages/plugin-ext/src/plugin/webviews.ts
@@ -271,7 +271,11 @@ export class WebviewPanelImpl implements theia.WebviewPanel {
     set iconPath(iconPath: theia.Uri | { light: theia.Uri; dark: theia.Uri }) {
         this.checkIsDisposed();
         if (URI.isUri(iconPath)) {
-            this.proxy.$setIconPath(this.viewId, (<theia.Uri>iconPath).path);
+            if ('http' === iconPath.scheme || 'https' === iconPath.scheme) {
+                this.proxy.$setIconPath(this.viewId, iconPath.toString());
+            } else {
+                this.proxy.$setIconPath(this.viewId, (<theia.Uri>iconPath).path);
+            }
         } else {
             this.proxy.$setIconPath(this.viewId, {
                 light: (<{ light: theia.Uri; dark: theia.Uri }>iconPath).light.path,