diff --git a/emper/Fiber.hpp b/emper/Fiber.hpp
index 81806b2359f9423522a461c9a42fd0b64f7ad250..80ae46f92ac783c06884f2f75de32236d171da2e 100644
--- a/emper/Fiber.hpp
+++ b/emper/Fiber.hpp
@@ -116,7 +116,7 @@ private:
 
 public:
 
-	unsigned int getFlag() {
+	unsigned int getFlag() const {
 		return flag;
 	}