diff --git a/src/main/java/edu/kit/provideq/toolbox/api/ProblemDto.java b/src/main/java/edu/kit/provideq/toolbox/api/ProblemDto.java
index 6485d170..e53db2f5 100644
--- a/src/main/java/edu/kit/provideq/toolbox/api/ProblemDto.java
+++ b/src/main/java/edu/kit/provideq/toolbox/api/ProblemDto.java
@@ -8,7 +8,6 @@
 import edu.kit.provideq.toolbox.meta.setting.SolverSetting;
 import java.util.Collections;
 import java.util.List;
-import java.util.Optional;
 
 /**
  * Data transfer object for {@link Problem problems}, used in REST API request bodies and responses.