diff --git a/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java b/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
index d86855f..426ebd5 100644
--- a/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
+++ b/src/main/java/net/fabricmc/loom/providers/MappingsProvider.java
@@ -153,7 +153,7 @@ public class MappingsProvider extends DependencyProvider {
 	private void storeMappings(Project project, MinecraftProvider minecraftProvider, Path yarnJar) throws IOException {
 		project.getLogger().lifecycle(":extracting " + yarnJar.getFileName());
 
-		try (FileSystem fileSystem = FileSystems.newFileSystem(yarnJar, null)) {
+		try (FileSystem fileSystem = FileSystems.newFileSystem(yarnJar, (ClassLoader) null)) {
 			extractMappings(fileSystem, baseTinyMappings);
 		}
 
@@ -189,7 +189,7 @@ public class MappingsProvider extends DependencyProvider {
 	}
 
 	private boolean doesJarContainV2Mappings(Path path) throws IOException {
-		try (FileSystem fs = FileSystems.newFileSystem(path, null)) {
+		try (FileSystem fs = FileSystems.newFileSystem(path, (ClassLoader) null)) {
 			try (BufferedReader reader = Files.newBufferedReader(fs.getPath("mappings", "mappings.tiny"))) {
 				TinyV2Factory.readMetadata(reader);
 				return true;
@@ -207,14 +207,14 @@ public class MappingsProvider extends DependencyProvider {
 		Path unmergedIntermediary = Paths.get(mappingsStepsDir.toString(), "unmerged-intermediary.tiny");
 		project.getLogger().info(":extracting " + unmergedIntermediaryJar.getFileName());
 
-		try (FileSystem unmergedIntermediaryFs = FileSystems.newFileSystem(unmergedIntermediaryJar, null)) {
+		try (FileSystem unmergedIntermediaryFs = FileSystems.newFileSystem(unmergedIntermediaryJar, (ClassLoader) null)) {
 			extractMappings(unmergedIntermediaryFs, unmergedIntermediary);
 		}
 
 		Path unmergedYarn = Paths.get(mappingsStepsDir.toString(), "unmerged-yarn.tiny");
 		project.getLogger().info(":extracting " + unmergedYarnJar.getFileName());
 
-		try (FileSystem unmergedYarnJarFs = FileSystems.newFileSystem(unmergedYarnJar, null)) {
+		try (FileSystem unmergedYarnJarFs = FileSystems.newFileSystem(unmergedYarnJar, (ClassLoader) null)) {
 			extractMappings(unmergedYarnJarFs, unmergedYarn);
 		}
 
diff --git a/src/main/java/net/fabricmc/loom/task/MigrateMappingsTask.java b/src/main/java/net/fabricmc/loom/task/MigrateMappingsTask.java
index a410c0f..d39151e 100644
--- a/src/main/java/net/fabricmc/loom/task/MigrateMappingsTask.java
+++ b/src/main/java/net/fabricmc/loom/task/MigrateMappingsTask.java
@@ -136,7 +136,7 @@ public class MigrateMappingsTask extends AbstractLoomTask {
 	private static TinyTree getMappings(File mappings) throws IOException {
 		Path temp = Files.createTempFile("mappings", ".tiny");
 
-		try (FileSystem fileSystem = FileSystems.newFileSystem(mappings.toPath(), null)) {
+		try (FileSystem fileSystem = FileSystems.newFileSystem(mappings.toPath(), (ClassLoader) null)) {
 			Files.copy(fileSystem.getPath("mappings/mappings.tiny"), temp, StandardCopyOption.REPLACE_EXISTING);
 		}