diff --git a/frontend/packages/helm-plugin/src/components/forms/url-chart/HelmURLChartInstallPage.tsx b/frontend/packages/helm-plugin/src/components/forms/url-chart/HelmURLChartInstallPage.tsx
index f1367bd4847..3d19b7e6f63 100644
--- a/frontend/packages/helm-plugin/src/components/forms/url-chart/HelmURLChartInstallPage.tsx
+++ b/frontend/packages/helm-plugin/src/components/forms/url-chart/HelmURLChartInstallPage.tsx
@@ -33,9 +33,9 @@ import { WizardStep } from './types';
 
 // Only OCI refs use tag (chart:version); HTTP/HTTPS chart URLs (.tgz) must not have :version appended
 const getFullChartURL = (chartURL: string, chartVersion: string): string => {
-  if (!chartVersion) return chartURL;
-  const isOCI = chartURL.startsWith('oci://');
-  return isOCI ? `${chartURL}:${chartVersion}` : chartURL;
+  if (!chartVersion || !/^oci:\/\//i.test(chartURL)) return chartURL;
+  const base = chartURL.replace(/:[^/]+$/, '');
+  return `${base}:${chartVersion}`;
 };
 
 const HelmURLChartInstallPage: FunctionComponent = () => {