diff --git a/embassy-boot/boot/src/firmware_updater.rs b/embassy-boot/boot/src/firmware_updater.rs
index 92987825..aeea206f 100644
--- a/embassy-boot/boot/src/firmware_updater.rs
+++ b/embassy-boot/boot/src/firmware_updater.rs
@@ -40,6 +40,7 @@ pub struct FirmwareUpdater {
     dfu: Partition,
 }
 
+#[cfg(target_os = "none")]
 impl Default for FirmwareUpdater {
     fn default() -> Self {
         extern "C" {
diff --git a/embassy-boot/nrf/src/lib.rs b/embassy-boot/nrf/src/lib.rs
index 14bea1f7..710798bd 100644
--- a/embassy-boot/nrf/src/lib.rs
+++ b/embassy-boot/nrf/src/lib.rs
@@ -15,6 +15,7 @@ pub struct BootLoader<const BUFFER_SIZE: usize = PAGE_SIZE> {
     aligned_buf: AlignedBuffer<BUFFER_SIZE>,
 }
 
+#[cfg(target_os = "none")]
 impl Default for BootLoader<PAGE_SIZE> {
     /// Create a new bootloader instance using parameters from linker script
     fn default() -> Self {
diff --git a/embassy-boot/rp/src/lib.rs b/embassy-boot/rp/src/lib.rs
index 0d577f08..fb9bc324 100644
--- a/embassy-boot/rp/src/lib.rs
+++ b/embassy-boot/rp/src/lib.rs
@@ -51,6 +51,7 @@ impl<const BUFFER_SIZE: usize> BootLoader<BUFFER_SIZE> {
     }
 }
 
+#[cfg(target_os = "none")]
 impl Default for BootLoader<ERASE_SIZE> {
     /// Create a new bootloader instance using parameters from linker script
     fn default() -> Self {
diff --git a/embassy-boot/stm32/src/lib.rs b/embassy-boot/stm32/src/lib.rs
index 88ce1c87..ccf136c7 100644
--- a/embassy-boot/stm32/src/lib.rs
+++ b/embassy-boot/stm32/src/lib.rs
@@ -46,6 +46,7 @@ impl<const BUFFER_SIZE: usize> BootLoader<BUFFER_SIZE> {
     }
 }
 
+#[cfg(target_os = "none")]
 impl<const BUFFER_SIZE: usize> Default for BootLoader<BUFFER_SIZE> {
     /// Create a new bootloader instance using parameters from linker script
     fn default() -> Self {