diff --git a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java b/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
index 8b5f5f6..4c0e21a 100644
--- a/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
+++ b/src/main/java/net/fabricmc/loom/decompilers/fernflower/ForkingJavaExec.java
@@ -24,11 +24,12 @@
 
 package net.fabricmc.loom.decompilers.fernflower;
 
+import java.util.HashSet;
+import java.util.Set;
+
 import org.gradle.api.Action;
 import org.gradle.api.Project;
-import org.gradle.api.artifacts.ConfigurationContainer;
-import org.gradle.api.artifacts.dsl.DependencyHandler;
-import org.gradle.api.file.FileCollection;
+import org.gradle.api.artifacts.Configuration;
 import org.gradle.process.ExecResult;
 import org.gradle.process.JavaExecSpec;
 
@@ -40,14 +41,21 @@ import org.gradle.process.JavaExecSpec;
  */
 public class ForkingJavaExec {
 	public static ExecResult javaexec(Project project, Action<? super JavaExecSpec> action) {
-		ConfigurationContainer configurations = project.getBuildscript().getConfigurations();
-		DependencyHandler handler = project.getDependencies();
-		FileCollection classpath = configurations.getByName("classpath")//
-						.plus(configurations.detachedConfiguration(handler.localGroovy()));
-
 		return project.javaexec(spec -> {
-			spec.classpath(classpath);
+			spec.classpath(getForkedFernflowerClasspath(project));
 			action.execute(spec);
 		});
 	}
+
+	private static Set<Configuration> getForkedFernflowerClasspath(Project project) {
+		Set<Configuration> allConfigurations = new HashSet<>();
+		Project p = project;
+
+		do {
+			allConfigurations.addAll(p.getBuildscript().getConfigurations());
+			p = p.getRootProject();
+		} while (p != p.getRootProject());
+
+		return allConfigurations;
+	}
 }