diff --git a/src/storm/storage/jani/Assignment.cpp b/src/storm/storage/jani/Assignment.cpp
index 19655a132..25fa036af 100644
--- a/src/storm/storage/jani/Assignment.cpp
+++ b/src/storm/storage/jani/Assignment.cpp
@@ -44,7 +44,7 @@ namespace storm  {
             return level;
         }
 
-        void Assignment::setLevel(int64_t level) const {
+        void Assignment::setLevel(int64_t level)  {
             this->level = level;
         }