diff --git a/wally/suits/io/check_warmup.cfg b/wally/suits/io/check_warmup.cfg
index 6a9c622..37ee083 100644
--- a/wally/suits/io/check_warmup.cfg
+++ b/wally/suits/io/check_warmup.cfg
@@ -6,7 +6,7 @@
 wait_for_previous
 filename={FILENAME}
 iodepth=1
-size=10Gb
+size=10G
 time_based
 runtime=30