diff --git a/cmd/cue/cmd/custom.go b/cmd/cue/cmd/custom.go
index 22e5a79..5ab3cdf 100644
--- a/cmd/cue/cmd/custom.go
+++ b/cmd/cue/cmd/custom.go
@@ -283,13 +283,23 @@
 			exitIfErr(cmd, inst, err, true)
 		}
 
+		visited := make(map[string]bool)
 		task.Walk(func(v cue.Value) bool {
 			if v == task {
 				return true
 			}
-			if after.Err() == nil && v.Equals(after) {
-				return false
+
+			// Prevent inifinite walks
+			_, vPath := v.Reference()
+			if vPath != nil {
+				vPath := string(keyForReference(vPath...))
+				_, isVisited := visited[vPath]
+				if isVisited {
+					return false
+				}
+				visited[vPath] = true
 			}
+
 			for _, r := range appendReferences(nil, cr.root, v) {
 				if dep := cr.findTask(r); dep != nil && t != dep {
 					// TODO(string): consider adding dependencies
diff --git a/cmd/cue/cmd/testdata/script/cmd_dep_cycle.txt b/cmd/cue/cmd/testdata/script/cmd_dep_cycle.txt
new file mode 100644
index 0000000..56f6cfd
--- /dev/null
+++ b/cmd/cue/cmd/testdata/script/cmd_dep_cycle.txt
@@ -0,0 +1,33 @@
+! cue cmd cycle
+cmp stderr expect-stderr
+! cue cmd aftercycle
+cmp stderr expect-stderr
+cue cmd interlockedTasks
+cmp stdout interlocked-stdout
+
+-- expect-stderr --
+cyclic dependency in tasks
+-- interlocked-stdout --
+v
+v
+-- after_tool.cue --
+package home
+
+import (
+	"tool/cli"
+)
+
+command: interlockedTasks: {
+  t1: cli.Print & { text: ref.value, ref: t2, value: "v" }
+  t2: cli.Print & { text: ref.value, ref: t1, value: "v" }
+}
+
+command: aftercycle: {
+	t1: cli.Print & { $after: t2, text: "t1" }
+	t2: cli.Print & { $after: t1, text: "t2" }
+}
+
+command: cycle: {
+	t1: cli.Print & { text: t2.text }
+	t2: cli.Print & { text: t1.text }
+}