diff --git a/nix/ec2.nix b/nix/ec2.nix
index da1640943..f2fef3ba3 100644
--- a/nix/ec2.nix
+++ b/nix/ec2.nix
@@ -114,6 +114,8 @@ let
    || cfg.instanceType == "cc2.8xlarge"
    || cfg.instanceType == "hs1.8xlarge"
    || cfg.instanceType == "cr1.8xlarge"
+   || builtins.substring 0 2 cfg.instanceType == "i2"
+   || builtins.substring 0 2 cfg.instanceType == "c3"
    || builtins.substring 0 2 cfg.instanceType == "m3";
 
   # Map "/dev/mapper/xvdX" to "/dev/xvdX".