diff --git a/src/include/writer_adios2.hxx b/src/include/writer_adios2.hxx
index 9eaf69aaa..fec6ad15b 100644
--- a/src/include/writer_adios2.hxx
+++ b/src/include/writer_adios2.hxx
@@ -7,7 +7,7 @@
 
 #include <cstdio>
 
-#define PSC_USE_IO_THREADS
+// #define PSC_USE_IO_THREADS
 
 #ifdef PSC_USE_IO_THREADS