diff --git a/lib/src/bootloader.rs b/lib/src/bootloader.rs
index d73577f5..e90b365e 100644
--- a/lib/src/bootloader.rs
+++ b/lib/src/bootloader.rs
@@ -9,6 +9,9 @@ use crate::task::Task;
 pub(crate) const EFI_DIR: &str = "efi";
 pub(crate) const PREPBOOT_GUID: &str = "9E1A2D38-C612-4316-AA26-8B49521E5A8B";
 pub(crate) const PREPBOOT_LABEL: &str = "PowerPC-PReP-boot";
+#[cfg(target_arch = "powerpc64")]
+/// We make a best-effort to support MBR partitioning too.
+pub(crate) const PREPBOOT_MBR_TYPE: &str = "41";
 
 /// Find the device to pass to bootupd. Only on powerpc64 right now
 /// we explicitly find one with a specific label.
@@ -20,7 +23,7 @@ fn get_bootupd_device(device: &PartitionTable) -> Result<Utf8PathBuf> {
         return device
             .partitions
             .iter()
-            .find(|p| p.parttype.as_str() == PREPBOOT_GUID)
+            .find(|p| matches!(p.parttype.as_str(), PREPBOOT_GUID | PREPBOOT_MBR_TYPE))
             .ok_or_else(|| {
                 anyhow::anyhow!("Failed to find PReP partition with GUID {PREPBOOT_GUID}")
             })