diff --git a/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java b/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
index 4775599b..872fb6fa 100644
--- a/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
+++ b/src/main/java/net/fabricmc/loom/configuration/mods/ModProcessor.java
@@ -24,6 +24,8 @@
 
 package net.fabricmc.loom.configuration.mods;
 
+import java.io.ByteArrayInputStream;
+import java.io.ByteArrayOutputStream;
 import java.io.File;
 import java.io.IOException;
 import java.io.UncheckedIOException;
@@ -33,6 +35,7 @@ import java.util.ArrayList;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
+import java.util.jar.Manifest;
 
 import com.google.gson.JsonObject;
 import org.gradle.api.Project;
@@ -47,6 +50,7 @@ import net.fabricmc.loom.configuration.RemappedConfigurationEntry;
 import net.fabricmc.loom.configuration.processors.dependency.ModDependencyInfo;
 import net.fabricmc.loom.configuration.providers.mappings.MappingsProviderImpl;
 import net.fabricmc.loom.kotlin.remapping.KotlinMetadataTinyRemapperExtension;
+import net.fabricmc.loom.task.RemapJarTask;
 import net.fabricmc.loom.util.Constants;
 import net.fabricmc.loom.util.TinyRemapperHelper;
 import net.fabricmc.loom.util.ZipUtils;
@@ -217,8 +221,21 @@ public class ModProcessor {
 			}
 
 			stripNestedJars(info.getRemappedOutput());
+			remapJarManifestEntries(info.getRemappedOutput().toPath());
 
 			info.finaliseRemapping();
 		}
 	}
+
+	private void remapJarManifestEntries(Path jar) throws IOException {
+		ZipUtils.transform(jar, Map.of(RemapJarTask.MANIFEST_PATH, bytes -> {
+			var manifest = new Manifest(new ByteArrayInputStream(bytes));
+
+			manifest.getMainAttributes().putValue(RemapJarTask.MANIFEST_NAMESPACE_KEY, toM);
+
+			ByteArrayOutputStream out = new ByteArrayOutputStream();
+			manifest.write(out);
+			return out.toByteArray();
+		}));
+	}
 }
diff --git a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
index 83af5533..86f43489 100644
--- a/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
+++ b/src/main/java/net/fabricmc/loom/task/RemapJarTask.java
@@ -83,7 +83,8 @@ import net.fabricmc.tinyremapper.OutputConsumerPath;
 import net.fabricmc.tinyremapper.TinyRemapper;
 
 public abstract class RemapJarTask extends AbstractRemapJarTask {
-	private static final String MANIFEST_PATH = "META-INF/MANIFEST.MF";
+	public static final String MANIFEST_PATH = "META-INF/MANIFEST.MF";
+	public static final String MANIFEST_NAMESPACE_KEY = "Fabric-Mapping-Namespace";
 
 	@InputFiles
 	public abstract ConfigurableFileCollection getNestedJars();
@@ -306,7 +307,7 @@ public abstract class RemapJarTask extends AbstractRemapJarTask {
 				var manifest = new Manifest(new ByteArrayInputStream(bytes));
 
 				getParameters().getJarManifestService().get().apply(manifest, getParameters().getManifestAttributes().get());
-				manifest.getMainAttributes().putValue("Fabric-Mapping-Namespace", getParameters().getTargetNamespace().get());
+				manifest.getMainAttributes().putValue(MANIFEST_NAMESPACE_KEY, getParameters().getTargetNamespace().get());
 
 				ByteArrayOutputStream out = new ByteArrayOutputStream();
 				manifest.write(out);