diff --git a/utils.go b/utils.go
index 24b7df1f..a720e3d2 100644
--- a/utils.go
+++ b/utils.go
@@ -366,24 +366,15 @@ func runProcess(container libcontainer.Container, config *specs.Process, listenF
 	return handler.forward(process)
 }
 
-func validateProcessSpec(spec ...interface{}) error {
-	for _, arg := range spec {
-		switch a := arg.(type) {
-		case *specs.Process:
-			if a.Cwd == "" {
-				return fmt.Errorf("Cwd property must not be empty")
-			}
-			if !filepath.IsAbs(a.Cwd) {
-				return fmt.Errorf("Cwd must be an absolute path")
-			}
-			if len(a.Args) == 0 {
-				return fmt.Errorf("args must not be empty")
-			}
-		//TODO
-		//Add for remaining spec validation
-		default:
-			return fmt.Errorf("not a valid spec")
-		}
+func validateProcessSpec(spec *specs.Process) error {
+	if spec.Cwd == "" {
+		return fmt.Errorf("Cwd property must not be empty")
+	}
+	if !filepath.IsAbs(spec.Cwd) {
+		return fmt.Errorf("Cwd must be an absolute path")
+	}
+	if len(spec.Args) == 0 {
+		return fmt.Errorf("args must not be empty")
 	}
 	return nil
 }