diff --git a/pkg/vm/invocation_tree.go b/pkg/vm/invocation_tree.go
index dec64d11a..8019bf467 100644
--- a/pkg/vm/invocation_tree.go
+++ b/pkg/vm/invocation_tree.go
@@ -8,5 +8,5 @@ import (
 // you can see how contracts called each other.
 type InvocationTree struct {
 	Current util.Uint160      `json:"hash"`
-	Calls   []*InvocationTree `json:"calls,omitempty"`
+	Calls   []*InvocationTree `json:"call,omitempty"`
 }