diff --git a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/AbstractMappedMinecraftProvider.java b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/AbstractMappedMinecraftProvider.java
index d88d3dd9..84d76e02 100644
--- a/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/AbstractMappedMinecraftProvider.java
+++ b/src/main/java/net/fabricmc/loom/configuration/providers/minecraft/mapped/AbstractMappedMinecraftProvider.java
@@ -126,11 +126,13 @@ public abstract class AbstractMappedMinecraftProvider<M extends MinecraftProvide
 	}
 
 	protected String getName(String name) {
+		String computedName = "minecraft-" + name;;
+
 		if (getTargetNamespace() != MappingsNamespace.NAMED) {
-			name = getTargetNamespace().name().toLowerCase(Locale.ROOT) + "-" + name;
+			computedName = getTargetNamespace().name() + "-" + name;
 		}
 
-		return "minecraft-" + name;
+		return computedName.toLowerCase(Locale.ROOT);
 	}
 
 	protected String getVersion() {
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 e4b4c844..005fbdf1 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.io.IOException;
 import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.List;
+import java.util.Locale;
 import java.util.Objects;
 
 import org.gradle.api.Project;
@@ -119,11 +120,11 @@ public abstract class ProcessedNamedMinecraftProvider<M extends MinecraftProvide
 		final Project project = getProject();
 
 		if (project.getRootProject() == project) {
-			return "minecraft-%s-project-root".formatted(name);
+			return "minecraft-%s-project-root".formatted(name).toLowerCase(Locale.ROOT);
 		}
 
 		final String projectPath = project.getPath().replace(':', '@');
-		return "minecraft-%s-project-%s".formatted(name, projectPath);
+		return "minecraft-%s-project-%s".formatted(name, projectPath).toLowerCase(Locale.ROOT);
 	}
 
 	@Override