diff --git a/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetDependencyExtensionImpl.java b/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetDependencyExtensionImpl.java
index 10156e696..5cab21e11 100644
--- a/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetDependencyExtensionImpl.java
+++ b/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetDependencyExtensionImpl.java
@@ -43,15 +43,13 @@ public void on(SourceSet sourceSet) {
         final SourceSetInheritanceExtension sourceSetInheritanceExtension = target.getExtensions().getByType(SourceSetInheritanceExtension.class);
         sourceSetInheritanceExtension.from(sourceSet);
 
-        target.setCompileClasspath(
-                target.getCompileClasspath().plus(
-                        sourceSet.getOutput()
-                )
+        project.getDependencies().add(
+                target.getCompileClasspathConfigurationName(),
+                sourceSet.getOutput()
         );
-        target.setRuntimeClasspath(
-                target.getRuntimeClasspath().plus(
-                        sourceSet.getOutput()
-                )
+        project.getDependencies().add(
+                target.getRuntimeClasspathConfigurationName(),
+                sourceSet.getOutput()
         );
     }
 }
diff --git a/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetInheritanceExtensionImpl.java b/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetInheritanceExtensionImpl.java
index b4ce6bcd5..39ed390ac 100644
--- a/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetInheritanceExtensionImpl.java
+++ b/common/src/main/java/net/neoforged/gradle/common/extensions/sourcesets/SourceSetInheritanceExtensionImpl.java
@@ -39,15 +39,11 @@ public void from(SourceSet sourceSet) {
             );
         }
 
-        target.setCompileClasspath(
-                target.getCompileClasspath().plus(
-                        sourceSet.getCompileClasspath()
-                )
+        project.getConfigurations().getByName(target.getCompileClasspathConfigurationName()).extendsFrom(
+                project.getConfigurations().getByName(sourceSet.getCompileClasspathConfigurationName())
         );
-        target.setRuntimeClasspath(
-                target.getRuntimeClasspath().plus(
-                        sourceSet.getRuntimeClasspath()
-                )
+        project.getConfigurations().getByName(target.getRuntimeClasspathConfigurationName()).extendsFrom(
+                project.getConfigurations().getByName(sourceSet.getRuntimeClasspathConfigurationName())
         );
     }
 }