diff --git a/tools/perf/util/python.c b/tools/perf/util/python.c
index 9181bf212fb99640e01987a3604131c990553d04..a2657fd96837837566af611c421c1fdd4eccb6ca 100644
--- a/tools/perf/util/python.c
+++ b/tools/perf/util/python.c
@@ -1015,6 +1015,8 @@ PyMODINIT_FUNC initperf(void)
 	    pyrf_cpu_map__setup_types() < 0)
 		return;
 
+	page_size = sysconf(_SC_PAGE_SIZE);
+
 	Py_INCREF(&pyrf_evlist__type);
 	PyModule_AddObject(module, "evlist", (PyObject*)&pyrf_evlist__type);