diff --git a/Parser/tokenizer.c b/Parser/tokenizer.c
index d17da2a..79ed87d 100644
--- a/Parser/tokenizer.c
+++ b/Parser/tokenizer.c
@@ -452,7 +452,7 @@
 {
 	PyObject *readline = NULL, *stream = NULL, *io = NULL;
 
-	io = PyImport_ImportModule("io");
+	io = PyImport_ImportModuleNoBlock("io");
 	if (io == NULL)
 		goto cleanup;