diff --git a/buildbot/buildbot_steps.sh b/buildbot/buildbot_steps.sh
index 92f58a9..89f32a1 100755
--- a/buildbot/buildbot_steps.sh
+++ b/buildbot/buildbot_steps.sh
@@ -46,6 +46,9 @@ function sed_enabled_ipxe_features() {
           "${ipxe_src_dir}/src/config/general.h"
     done 
 
+    echo "Downloading default iPXE CA certificate"
+    wget -O ipxe_root_ca.crt https://ipxe.org/_media/certs/ca.crt
+
     return 0
 }
 
@@ -79,7 +82,7 @@ function make_ipxe_lkrn() {
     curr="$(pwd)"
     cd "${ipxe_src_dir}/src/" || return 1
 
-    make bin/ipxe.lkrn EMBED="${embed_file}" CERT="${signing_cert},${ca_cert}" TRUST="${ca_cert}" || return 2
+    make bin/ipxe.lkrn EMBED="${embed_file}" CERT="ipxe_root_ca.crt,${signing_cert},${ca_cert}" TRUST="ipxe_root_ca.crt,${ca_cert}" || return 2
 
     cd "$curr"
     return 0
@@ -115,7 +118,7 @@ function make_ipxe_iso() {
     curr="$(pwd)"
     cd "${ipxe_src_dir}/src/" || return 1
 
-    make bin/ipxe.iso EMBED="${embed_file}" CERT="${signing_cert},${ca_cert}" TRUST="${ca_cert}" || return 2
+    make bin/ipxe.iso EMBED="${embed_file}" CERT="ipxe_root_ca.crt,${signing_cert},${ca_cert}" TRUST="ipxe_root_ca.crt,${ca_cert}" || return 2
 
     cd "$curr"
     return 0
@@ -151,7 +154,7 @@ function make_ipxe_dsk() {
     curr="$(pwd)"
     cd "${ipxe_src_dir}/src/" || return 1
 
-    make bin/ipxe.usb EMBED="${embed_file}" CERT="${signing_cert},${ca_cert}" TRUST="${ca_cert}" || return 2
+    make bin/ipxe.usb EMBED="${embed_file}" CERT="ipxe_root_ca.crt,${signing_cert},${ca_cert}" TRUST="ipxe_root_ca.crt,${ca_cert}" || return 2
 
     cd "$curr"
     return 0
@@ -187,7 +190,7 @@ function make_ipxe_pxe() {
     curr="$(pwd)"
     cd "${ipxe_src_dir}/src/" || return 1
 
-    make bin/ipxe.pxe EMBED="${embed_file}" CERT="${signing_cert},${ca_cert}" TRUST="${ca_cert}" || return 2
+    make bin/ipxe.pxe EMBED="${embed_file}" CERT="ipxe_root_ca.crt,${signing_cert},${ca_cert}" TRUST="ipxe_root_ca.crt,${ca_cert}" || return 2
 
     cd "$curr"
     return 0
@@ -227,7 +230,7 @@ function make_ipxe_efi() {
     curr="$(pwd)"
     cd "${ipxe_src_dir}/src/" || return 1
 
-    make bin-x86_64-efi/ipxe.efi EMBED="${embed_file}" CERT="${signing_cert},${ca_cert}" TRUST="${ca_cert}" || return 2
+    make bin-x86_64-efi/ipxe.efi EMBED="${embed_file}" CERT="ipxe_root_ca.crt,${signing_cert},${ca_cert}" TRUST="ipxe_root_ca.crt,${ca_cert}" || return 2
     mv bin-x86_64-efi/ipxe.efi bin/
     sbsign --key ${efi_key} --cert ${efi_cert} --output bin/ipxe.efi bin/ipxe.efi