diff --git a/web/src/utils/api.ts b/web/src/utils/api.ts
index ba204fa769..ec428b65d9 100644
--- a/web/src/utils/api.ts
+++ b/web/src/utils/api.ts
@@ -85,7 +85,7 @@ export default {
   traceIndex: (datasetId: string, indexType: string) =>
     `${restAPIv1}/datasets/${datasetId}/index?type=${indexType}`,
   unbindPipelineTask: (datasetId: string, indexType: string) =>
-    `${restAPIv1}/datasets/${datasetId}/${indexType}`,
+    `${restAPIv1}/datasets/${datasetId}/${indexType.toLowerCase()}`,
   pipelineRerun: `${webAPI}/canvas/rerun`,
   getMetaData: (datasetId: string) =>
     `${restAPIv1}/datasets/${datasetId}/metadata/summary`,