diff --git a/sled-hardware/src/illumos/partitions.rs b/sled-hardware/src/illumos/partitions.rs
index 1d89a76a02..5c129b410b 100644
--- a/sled-hardware/src/illumos/partitions.rs
+++ b/sled-hardware/src/illumos/partitions.rs
@@ -56,7 +56,6 @@ fn preferred_nvme_device_settings(
 }
 
 #[derive(Debug, thiserror::Error)]
-#[cfg(target_os = "illumos")]
 pub enum NvmeFormattingError {
     #[error(transparent)]
     NvmeInit(#[from] libnvme::NvmeInitError),
@@ -72,13 +71,6 @@ pub enum NvmeFormattingError {
     NoController(String),
 }
 
-#[derive(Debug, thiserror::Error)]
-#[cfg(not(target_os = "illumos"))]
-pub enum NvmeFormattingError {
-    #[error("NVMe formatting is unsupported on this platform")]
-    UnsupportedPlatform,
-}
-
 // The expected layout of an M.2 device within the Oxide rack.
 //
 // Partitions beyond this "expected partition" array are ignored.
@@ -225,7 +217,6 @@ fn internal_ensure_partition_layout<GPT: gpt::LibEfiGpt>(
     }
 }
 
-#[cfg(target_os = "illumos")]
 fn ensure_size_and_formatting(
     log: &Logger,
     identity: &DiskIdentity,
@@ -328,14 +319,6 @@ fn ensure_size_and_formatting(
     Ok(())
 }
 
-#[cfg(not(target_os = "illumos"))]
-fn ensure_size_and_formatting(
-    log: &Logger,
-    identity: &DiskIdentity,
-) -> Result<(), NvmeFormattingError> {
-    Ok(())
-}
-
 #[cfg(test)]
 mod test {
     use super::*;
diff --git a/sled-hardware/src/non_illumos/mod.rs b/sled-hardware/src/non_illumos/mod.rs
index d8372dd8aa..8518aae495 100644
--- a/sled-hardware/src/non_illumos/mod.rs
+++ b/sled-hardware/src/non_illumos/mod.rs
@@ -6,10 +6,17 @@ use crate::disk::{
     DiskPaths, DiskVariant, Partition, PooledDiskError, UnparsedDisk,
 };
 use crate::{Baseboard, SledMode};
+use omicron_common::disk::DiskIdentity;
 use slog::Logger;
 use std::collections::HashSet;
 use tokio::sync::broadcast;
 
+#[derive(Debug, thiserror::Error)]
+pub enum NvmeFormattingError {
+    #[error("NVMe formatting is unsupported on this platform")]
+    UnsupportedPlatform,
+}
+
 /// An unimplemented, stub representation of the underlying hardware.
 ///
 /// This is intended for non-illumos systems to have roughly the same interface
@@ -59,6 +66,7 @@ pub fn ensure_partition_layout(
     _log: &Logger,
     _paths: &DiskPaths,
     _variant: DiskVariant,
+    _identity: &DiskIdentity,
 ) -> Result<Vec<Partition>, PooledDiskError> {
     unimplemented!("Accessing hardware unsupported on non-illumos");
 }