diff --git a/act/jobparser/model.go b/act/jobparser/model.go
index 2ad615d3..f63a0455 100644
--- a/act/jobparser/model.go
+++ b/act/jobparser/model.go
@@ -259,6 +259,11 @@ func ParseRawOn(rawOn *yaml.Node) ([]*Event, error) {
 								return nil, fmt.Errorf("unknown on type: %#v", branches)
 							}
 						}
+					case map[string]interface{}:
+						if k != "workflow_dispatch" || act != "inputs" {
+							return nil, fmt.Errorf("unknown on type: %#v", v)
+						}
+						acts = nil
 					default:
 						return nil, fmt.Errorf("unknown on type: %#v", branches)
 					}
diff --git a/act/jobparser/model_test.go b/act/jobparser/model_test.go
index 859ee924..a034306f 100644
--- a/act/jobparser/model_test.go
+++ b/act/jobparser/model_test.go
@@ -186,6 +186,14 @@ func TestParseRawOn(t *testing.T) {
 				},
 			},
 		},
+		{
+			input: "on:\n  workflow_dispatch:\n    inputs:\n      test:\n        type: string",
+			result: []*Event{
+				{
+					Name: "workflow_dispatch",
+				},
+			},
+		},
 	}
 	for _, kase := range kases {
 		t.Run(kase.input, func(t *testing.T) {