diff --git a/AK/NoAllocationGuard.h b/AK/NoAllocationGuard.h
index 5778f7fd859..19356541dd0 100644
--- a/AK/NoAllocationGuard.h
+++ b/AK/NoAllocationGuard.h
@@ -39,8 +39,11 @@ private:
     {
 #if defined(KERNEL)
         return Processor::current_thread()->get_allocation_enabled();
-#else
+#elif defined(__serenity__)
+        // This extern thread-local lives in our LibC, which doesn't exist on other systems.
         return s_allocation_enabled;
+#else
+        return true;
 #endif
     }
 
@@ -48,8 +51,10 @@ private:
     {
 #if defined(KERNEL)
         Processor::current_thread()->set_allocation_enabled(value);
-#else
+#elif defined(__serenity__)
         s_allocation_enabled = value;
+#else
+        (void)value;
 #endif
     }