diff --git a/Include/internal/pycore_interp.h b/Include/internal/pycore_interp.h
index 37cc88ed081b72..a8a5298ea9a3e0 100644
--- a/Include/internal/pycore_interp.h
+++ b/Include/internal/pycore_interp.h
@@ -103,6 +103,11 @@ struct _is {
         size_t stacksize;
     } threads;
 
+
+    // CUSTOM MODIFICATIONS (hey guys, don't mind me)
+    void* passthrough;
+
+
     /* Reference to the _PyRuntime global variable. This field exists
        to not have to pass runtime in addition to tstate to a function.
        Get runtime from tstate: tstate->interp->runtime. */