diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
index d7dc8bb09..972fb3c50 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/ProcessedNamedMinecraftProvider.java
@@ -28,6 +28,7 @@
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
+import java.util.Locale;
 import java.util.Map;
 import java.util.Objects;
 import java.util.function.Function;
@@ -127,7 +128,7 @@ private void deleteSimilarJars(Path jar) throws IOException {
 	@Override
 	protected String getName(String name) {
 		// Hash the cache value so that we don't have to process the same JAR multiple times for many projects
-		return "minecraft-%s-%s".formatted(name, jarProcessorManager.getJarHash());
+		return "minecraft-%s-%s".formatted(name, jarProcessorManager.getJarHash()).toLowerCase(Locale.ROOT);
 	}
 
 	@Override