diff --git a/internal/internal_worker.go b/internal/internal_worker.go
index 50abde3e8..61af46002 100644
--- a/internal/internal_worker.go
+++ b/internal/internal_worker.go
@@ -2086,6 +2086,9 @@ func getFunctionName(i interface{}) (name string, isMethod bool) {
 	// var a *Activities
 	// ExecuteActivity(ctx, a.Foo)
 	// will call this function which is going to return "Foo"
+	if s, ok := i.(fmt.Stringer); ok {
+		return s.String(), false
+	}
 	return strings.TrimSuffix(shortName, "-fm"), isMethod
 }