diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
index 7e5ab002..a242dec9 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetExtendsWildcard.java
@@ -8,7 +8,7 @@ public record TargetExtendsWildcard(TargetType innerType) implements TargetType
 
     @Override
     public String toGenericSignature() {
-        return innerType.toGenericSignature();
+        return "+" + innerType.toGenericSignature();
     }
 
     @Override
diff --git a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
index bf16e143..52cc6dea 100644
--- a/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
+++ b/src/main/java/de/dhbwstuttgart/target/tree/type/TargetSuperWildcard.java
@@ -8,7 +8,7 @@ public record TargetSuperWildcard(TargetType innerType) implements TargetType {
 
     @Override
     public String toGenericSignature() {
-        return innerType.toGenericSignature();
+        return "-" + innerType.toGenericSignature();
     }
 
     @Override