diff --git a/CHANGELOG.md b/CHANGELOG.md
index 7c6e14d..e2ddc7a 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,7 @@
 ### Unreleased
 
 - Make defmt impls for fieldsets a bit more efficient by using type hints
+- Fixed cfg problem in the `read_all_registers` function
 
 ### 1.0.0 (28-12-24)
 
diff --git a/device-driver/tests/cfg-register.rs b/device-driver/tests/cfg-register.rs
new file mode 100644
index 0000000..25c855c
--- /dev/null
+++ b/device-driver/tests/cfg-register.rs
@@ -0,0 +1,86 @@
+use device_driver::RegisterInterface;
+
+pub struct DeviceInterface {
+    device_memory: [u8; 128],
+}
+
+impl Default for DeviceInterface {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl DeviceInterface {
+    pub const fn new() -> Self {
+        Self {
+            device_memory: [0; 128],
+        }
+    }
+}
+
+impl RegisterInterface for DeviceInterface {
+    type Error = ();
+    type AddressType = u8;
+
+    fn write_register(
+        &mut self,
+        address: Self::AddressType,
+        _size_bits: u32,
+        data: &[u8],
+    ) -> Result<(), Self::Error> {
+        self.device_memory[address as usize..][..data.len()].copy_from_slice(data);
+
+        Ok(())
+    }
+
+    fn read_register(
+        &mut self,
+        address: Self::AddressType,
+        _size_bits: u32,
+        data: &mut [u8],
+    ) -> Result<(), Self::Error> {
+        data.copy_from_slice(&self.device_memory[address as usize..][..data.len()]);
+        Ok(())
+    }
+}
+
+device_driver::create_device!(
+    device_name: MyTestDevice,
+    dsl: {
+        config {
+            type RegisterAddressType = u8;
+        }
+        #[cfg(not(windows))]
+        register Foo1 {
+            const ADDRESS = 0;
+            const SIZE_BITS = 8;
+            const RESET_VALUE = 20;
+
+            value: bool = 0,
+            generated: uint as try enum Gen {
+                A = 0,
+            } = 1..2,
+        },
+        #[cfg(windows)]
+        register Foo2 {
+            const ADDRESS = 1;
+            const SIZE_BITS = 8;
+            const RESET_VALUE = 10;
+
+            value: bool = 0,
+            generated: uint as try enum Gen {
+                A = 1,
+            } = 1..2,
+        },
+    }
+);
+
+#[test]
+fn test_basic_read_modify_write() {
+    let mut device = MyTestDevice::new(DeviceInterface::new());
+    device
+        .read_all_registers(|addr, name, val| {
+            println!("@{addr}: {name} = {val:?}");
+        })
+        .unwrap();
+}
diff --git a/generation/src/lir/token_transform/block_transform.rs b/generation/src/lir/token_transform/block_transform.rs
index d56d273..b0f3b1d 100644
--- a/generation/src/lir/token_transform/block_transform.rs
+++ b/generation/src/lir/token_transform/block_transform.rs
@@ -58,6 +58,7 @@ pub fn generate_block(
                 } => {
                     let register_name = &m.name;
                     let address = &m.address;
+                    let cfg_attr = &m.cfg_attr;
 
                     let read_function = match use_async {
                         true => quote! { read_async().await },
@@ -81,7 +82,9 @@ pub fn generate_block(
                     };
                     let index = Literal::i64_unsuffixed(index);
                     quote! {
+                        #cfg_attr
                         let reg = self.#register_name(#index_param).#read_function?;
+                        #cfg_attr
                         callback(#address + #index * #stride, #register_display_name, reg.into());
                     }
                 }))
@@ -328,8 +331,9 @@ mod tests {
                     where
                         I: ::device_driver::RegisterInterface<AddressType = u8>,
                     {
+                        #[cfg(unix)]
                         let reg = self.my_register1().read()?;
-                        callback(5 + 0 * 0, \"my_register1\", reg.into());
+                        #[cfg(unix)] callback(5 + 0 * 0, \"my_register1\", reg.into());
                         Ok(())
                     }
                     /// Read all readable register values in this block from the device.
@@ -352,8 +356,9 @@ mod tests {
                     where
                         I: ::device_driver::AsyncRegisterInterface<AddressType = u8>,
                     {
+                        #[cfg(unix)]
                         let reg = self.my_register1().read_async().await?;
-                        callback(5 + 0 * 0, \"my_register1\", reg.into());
+                        #[cfg(unix)] callback(5 + 0 * 0, \"my_register1\", reg.into());
                         Ok(())
                     }
                     ///42 is the answer