diff --git a/ipxe/netboot.xyz-dhcp b/ipxe/netboot.xyz-dhcp.ipxe
similarity index 100%
rename from ipxe/netboot.xyz-dhcp
rename to ipxe/netboot.xyz-dhcp.ipxe
diff --git a/ipxe/netboot.xyz-static b/ipxe/netboot.xyz-static.ipxe
similarity index 100%
rename from ipxe/netboot.xyz-static
rename to ipxe/netboot.xyz-static.ipxe
diff --git a/script/prep-release.sh b/script/prep-release.sh
index ef242c0d..48a54041 100755
--- a/script/prep-release.sh
+++ b/script/prep-release.sh
@@ -12,7 +12,7 @@ cp ipxe/local/* ipxe_build/src/config/local/
 
 # build iPXE disks
 cd ipxe_build/src
-for ipxe_config in `ls ../../ipxe/`
+for ipxe_config in `ls ../../ipxe/*.ipxe`
 do 
   make EMBED=../../ipxe/$ipxe_config
   mv bin/ipxe.dsk ../../build/ipxe/$ipxe_config.dsk