diff --git a/src/main/java/net/fabricmc/loom/util/MapJarsTiny.java b/src/main/java/net/fabricmc/loom/util/MapJarsTiny.java
index 7088a37..aabad99 100644
--- a/src/main/java/net/fabricmc/loom/util/MapJarsTiny.java
+++ b/src/main/java/net/fabricmc/loom/util/MapJarsTiny.java
@@ -63,6 +63,7 @@ public class MapJarsTiny {
 
 			TinyRemapper remapper = TinyRemapper.newRemapper()
 					.withMappings(TinyUtils.createTinyMappingProvider(mappings, fromM, toM))
+					.rebuildSourceFilenames(true)
 					.build();
 
 			try (OutputConsumerPath outputConsumer = new OutputConsumerPath(output)) {