diff --git a/equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/reflection/vintage/prefabvalues/factories/MapFactory.java b/equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/reflection/vintage/prefabvalues/factories/MapFactory.java
index f835cfe90..5673808f7 100644
--- a/equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/reflection/vintage/prefabvalues/factories/MapFactory.java
+++ b/equalsverifier-core/src/main/java/nl/jqno/equalsverifier/internal/reflection/vintage/prefabvalues/factories/MapFactory.java
@@ -43,7 +43,7 @@ public Tuple<T> createValues(
 
         T blue = createEmpty.get();
         if (!redKey.equals(blueKey)) { // This happens with single-element enums
-            blue.put(valueProvider.giveBlue(keyTag), blueValue);
+            blue.put(blueKey, blueValue);
         }
 
         T redCopy = createEmpty.get();