diff --git a/Python/ast.c b/Python/ast.c
index 5555cf7..9354b59 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -1336,10 +1336,14 @@
         return Dict(keys, values, LINENO(n), n->n_col_offset, c->c_arena);
     }
     case BACKQUOTE: { /* repr */
-        if (Py_Py3kWarningFlag &&
-            PyErr_Warn(PyExc_DeprecationWarning,
-                "backquote not supported in 3.x") < 0)
-            return NULL;
+        if (Py_Py3kWarningFlag) {
+		if (PyErr_WarnExplicit(PyExc_DeprecationWarning,
+				       "backquote not supported in 3.x",
+				       "<unknown>", LINENO(n),
+				       NULL, NULL)) {
+			; //return NULL;
+		}
+	}
         expr_ty expression = ast_for_testlist(c, CHILD(n, 1));
         if (!expression)
             return NULL;