diff --git a/src/main/java/ftbsc/lll/mapper/impl/MultiMapper.java b/src/main/java/ftbsc/lll/mapper/impl/MultiMapper.java
index f0af490..7eeb0d5 100644
--- a/src/main/java/ftbsc/lll/mapper/impl/MultiMapper.java
+++ b/src/main/java/ftbsc/lll/mapper/impl/MultiMapper.java
@@ -51,7 +51,7 @@ public class MultiMapper extends AbstractMapper {
 			data.getFields().forEach((fieldName, fieldData) -> {
 				for(int i = 1; i < mapperList.size(); i++)
 					fieldData = mapperList.get(i).getFieldData(fieldData.parentClass.nameMapped, fieldData.nameMapped);
-				sumData.addField(fieldName, fieldData.nameMapped);
+				sumData.addField(fieldName, fieldData.nameMapped, fieldData.descriptor);
 			});
 
 			this.mappings.put(sumData.name, sumData);
diff --git a/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java b/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java
index 4bd0af0..784d0e0 100644
--- a/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java
+++ b/src/main/java/ftbsc/lll/mapper/tools/data/ClassData.java
@@ -89,7 +89,7 @@ public class ClassData {
 		ClassData reverse = new ClassData(this.nameMapped, this.name);
 		this.methods.forEach((signature, data) -> reverse.addMethod(nameMapped, signature.name,
 			MappingUtils.mapMethodDescriptor(signature.descriptor, mapper, false)));
-		this.fields.forEach((name, data) -> reverse.addField(data.nameMapped, name));
+		this.fields.forEach((name, data) -> reverse.addField(data.nameMapped, name, data.descriptor));
 		return reverse;
 	}