diff --git a/src/builders.ts b/src/builders.ts
index 7508c75..4d67de9 100644
--- a/src/builders.ts
+++ b/src/builders.ts
@@ -34,6 +34,7 @@ import {
 } from './tasks';
 
 const DefaultPipelineServiceAccountName = 'default:pipeline';
+const DefaultTaskServiceAccountName = 'default';
 
 /**
  * Creates the properties for a `ClusterRoleBinding`
@@ -1009,7 +1010,7 @@ export class TaskRunBuilder {
     this._scope = scope;
     this._id = id;
     this._task = task;
-    this._sa = DefaultPipelineServiceAccountName;
+    this._sa = DefaultTaskServiceAccountName;
     this._crbProps = DefaultClusterRoleBindingProps;
     this._runParams = new Array<TaskRunParam>();
     this._runWorkspaces = new Array<TaskRunWorkspace>();
diff --git a/test/__snapshots__/taskbuilder.test.ts.snap b/test/__snapshots__/taskbuilder.test.ts.snap
index e3c5140..60fb6b9 100644
--- a/test/__snapshots__/taskbuilder.test.ts.snap
+++ b/test/__snapshots__/taskbuilder.test.ts.snap
@@ -70,7 +70,7 @@ echo $(params.input)",
           "value": "Hello World!",
         },
       ],
-      "serviceAccountName": "default:default",
+      "serviceAccountName": "default",
       "taskRef": {
         "name": "echo-input",
       },
@@ -379,7 +379,7 @@ echo $(params.input)",
           "value": "Hello World!",
         },
       ],
-      "serviceAccountName": "default:pipeline",
+      "serviceAccountName": "default",
       "taskRef": {
         "name": "echo-input",
       },
@@ -407,7 +407,7 @@ exports[`TaskBuilderTest TaskRunResolver 1`] = `
     },
     "spec": {
       "params": [],
-      "serviceAccountName": "default:pipeline",
+      "serviceAccountName": "default",
       "taskRef": {
         "params": [
           {
diff --git a/test/taskbuilder.test.ts b/test/taskbuilder.test.ts
index 03ca263..0e29fa8 100644
--- a/test/taskbuilder.test.ts
+++ b/test/taskbuilder.test.ts
@@ -237,7 +237,7 @@ class TestCustomTaskRunBuilder extends Chart {
       'default',
       'default');
 
-    const serviceAccount = 'default:default';
+    const serviceAccount = 'default';
 
     new TaskRunBuilder(this, 'echo-input-run', myTask)
       .withRunParam('input', 'Hello World!')