diff --git a/act/model/workflow.go b/act/model/workflow.go
index 55b80fc3..7d0e9e91 100644
--- a/act/model/workflow.go
+++ b/act/model/workflow.go
@@ -321,7 +321,7 @@ type Step struct {
 	Env              yaml.Node         `yaml:"env"`
 	With             map[string]string `yaml:"with"`
 	ContinueOnError  bool              `yaml:"continue-on-error"`
-	TimeoutMinutes   int64             `yaml:"timeout-minutes"`
+	TimeoutMinutes   string            `yaml:"timeout-minutes"`
 }
 
 // String gets the name of step