diff --git a/flow/tasker/tasker.go b/flow/tasker/tasker.go
index 1291b3058..b82d0d674 100644
--- a/flow/tasker/tasker.go
+++ b/flow/tasker/tasker.go
@@ -150,7 +150,7 @@ func makeTask(ctx *flowctx.Context, node *hof.Node[any]) (cueflow.Runner, error)
 		}
 
 		if rerr != nil {
-			err = fmt.Errorf("in %q\n%v\n%+v", c.Value.Path(), cuetils.ExpandCueError(err), value)
+			rerr = fmt.Errorf("in %q\n%v\n%+v", c.Value.Path(), cuetils.ExpandCueError(rerr), value)
 			// fmt.Println("RunnerRunc Error:", err)
 			c.Error = rerr
 			bt.Error = rerr
diff --git a/flow/testdata/tasks/os/flow.cue b/flow/testdata/tasks/os/flow.cue
new file mode 100644
index 000000000..1914c9938
--- /dev/null
+++ b/flow/testdata/tasks/os/flow.cue
@@ -0,0 +1,5 @@
+tasks: {
+  @flow()
+	r: { filename: "in.txt", contents: string } @task(os.ReadFile)
+}
+
diff --git a/flow/testdata/tasks/os/golden.stdout b/flow/testdata/tasks/os/golden.stdout
new file mode 100644
index 000000000..1154b56e7
--- /dev/null
+++ b/flow/testdata/tasks/os/golden.stdout
@@ -0,0 +1,6 @@
+Error in tasks | tasks: task failed: in "r"
+open in.txt: no such file or directory
+
+<nil>
+
+1 error(s) were encountered
diff --git a/flow/testdata/tasks/os/readfile_003.txt b/flow/testdata/tasks/os/readfile_003.txt
index b8536ebf9..6f2d3836e 100644
--- a/flow/testdata/tasks/os/readfile_003.txt
+++ b/flow/testdata/tasks/os/readfile_003.txt
@@ -11,4 +11,6 @@ tasks: {
 Error in tasks | tasks: task failed: in "r"
 open in.txt: no such file or directory
 
+<nil>
+
 1 error(s) were encountered