diff --git a/conf/test.config b/conf/test.config
index bf4177b..e0676ec 100644
--- a/conf/test.config
+++ b/conf/test.config
@@ -28,6 +28,6 @@ params {
 
   // Resources for sorting summary statistics
   sumstat_sort_cores = 2
-  sumstat_sort_mem = 4G
+  sumstat_sort_mem = '4G'
 }
 trace.overwrite = true