diff --git a/fly.toml b/fly.toml
index af8cbb75..6cd98130 100644
--- a/fly.toml
+++ b/fly.toml
@@ -36,4 +36,4 @@ kill_timeout = 120
 [[vm]]
   cpu_kind = 'shared'
   cpus = 1
-  memory_mb = 512
+  memory = '512mb'