1 files changed, 2 insertions, 5 deletions

diff --git a/subprojects/store-query/src/main/java/tools/refinery/store/query/literal/BooleanLiteral.java b/subprojects/store-query/src/main/java/tools/refinery/store/query/literal/BooleanLiteral.java
index a32cfd80..e61f0535 100644
--- a/subprojects/store-query/src/main/java/tools/refinery/store/query/literal/BooleanLiteral.java
+++ b/subprojects/store-query/src/main/java/tools/refinery/store/query/literal/BooleanLiteral.java
@@ -5,12 +5,9 @@
  */
 package tools.refinery.store.query.literal;
 
-import tools.refinery.store.query.term.Variable;
 import tools.refinery.store.query.equality.LiteralEqualityHelper;
 import tools.refinery.store.query.substitution.Substitution;
 
-import java.util.Set;
-
 public enum BooleanLiteral implements CanNegate<BooleanLiteral> {
         TRUE(true),
         FALSE(false);
@@ -22,8 +19,8 @@ public enum BooleanLiteral implements CanNegate<BooleanLiteral> {
         }
 
         @Override
-        public Set<Variable> getBoundVariables() {
-                return Set.of();
+        public VariableBinder getVariableBinder() {
+                return VariableBinder.EMPTY;
         }
 
         @Override