diff --git a/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/core/BootstrapMixin.java b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/core/BootstrapMixin.java
index 89709891..f41ccb15 100644
--- a/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/core/BootstrapMixin.java
+++ b/forge/src/main/java/org/embeddedt/modernfix/forge/mixin/core/BootstrapMixin.java
@@ -28,7 +28,9 @@ public class BootstrapMixin {
     /* for https://github.com/MinecraftForge/MinecraftForge/issues/9505 */
     @Inject(method = "bootStrap", at = @At("RETURN"))
     private static void doClassloadHack(CallbackInfo ci) {
-        NetworkConstants.init();
-        LOGGER.info("Worked around Forge issue #9505");
+        if(!isBootstrapped) {
+            NetworkConstants.init();
+            LOGGER.info("Worked around Forge issue #9505");
+        }
     }
 }