diff --git a/job_files/blocks.ini b/job_files/blocks.ini
index 69fe8ab..7f7bcdb 100644
--- a/job_files/blocks.ini
+++ b/job_files/blocks.ini
@@ -1,5 +1,5 @@
 [global]
-ioengine=libaio
+ioengine=sync
 direct=1
 time_based=1
 runtime=30