diff --git a/src/statement.cpp b/src/statement.cpp
index b6b6cd2..d5cfd5b 100644
--- a/src/statement.cpp
+++ b/src/statement.cpp
@@ -180,7 +180,7 @@ namespace riddle
         else
         {
             pred_opt = scp.get_predicate(predicate_name.id);
-            if (!is_core(scp))
+            if (!is_core(pred_opt.value().get().get_scope()))
                 args.emplace("tau", ctx->get("tau")); // we inherit tau from the caller
         }