diff --git a/src/vim9expr.c b/src/vim9expr.c
index 3a329cc..8c7d0b0e 100644
--- a/src/vim9expr.c
+++ b/src/vim9expr.c
@@ -1040,7 +1040,7 @@
 	// The function reference count will be 1.  When the ISN_FUNCREF
 	// instruction is deleted the reference count is decremented and the
 	// function is freed.
-	return generate_FUNCREF(cctx, ufunc);
+	return generate_FUNCREF(cctx, ufunc, NULL);
     }
 
     func_ptr_unref(ufunc);