diff --git a/paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java b/paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
index 448b297035..93eb0f2c04 100644
--- a/paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
+++ b/paper-api/src/main/java/org/bukkit/plugin/java/JavaPluginLoader.java
@@ -27,6 +27,7 @@ import org.bukkit.event.vehicle.*;
 import org.bukkit.event.world.*;
 import org.bukkit.event.weather.*;
 import org.bukkit.plugin.*;
+import org.bukkit.plugin.java.annotations.DontExport;
 import org.yaml.snakeyaml.error.YAMLException;
 
 /**
@@ -217,7 +218,7 @@ public final class JavaPluginLoader implements PluginLoader {
     }
 
     public void setClass(final String name, final Class<?> clazz) {
-        if(!classes.containsKey(name)) {
+        if ((!classes.containsKey(name)) && (clazz.getAnnotation(DontExport.class) != null)) {
             classes.put(name, clazz);
         }
     }
diff --git a/paper-api/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java b/paper-api/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
index 91d4d6d3d6..f998e3098e 100644
--- a/paper-api/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
+++ b/paper-api/src/main/java/org/bukkit/plugin/java/PluginClassLoader.java
@@ -28,7 +28,7 @@ public class PluginClassLoader extends URLClassLoader {
         Class<?> result = classes.get(name);
 
         if (result == null) {
-            if(checkGlobal) {
+            if (checkGlobal) {
                 result = loader.getClassByName(name);
             }
 
diff --git a/paper-api/src/main/java/org/bukkit/plugin/java/annotations/DontExport.java b/paper-api/src/main/java/org/bukkit/plugin/java/annotations/DontExport.java
new file mode 100644
index 0000000000..dd6efb9bea
--- /dev/null
+++ b/paper-api/src/main/java/org/bukkit/plugin/java/annotations/DontExport.java
@@ -0,0 +1,16 @@
+
+package org.bukkit.plugin.java.annotations;
+
+import java.lang.annotation.ElementType;
+import java.lang.annotation.Retention;
+import java.lang.annotation.RetentionPolicy;
+import java.lang.annotation.Target;
+
+/**
+ * Flags a class as private and not to be exported with other plugins
+ */
+@Target(ElementType.TYPE)
+@Retention(RetentionPolicy.RUNTIME)
+public @interface DontExport {
+    
+}