diff --git a/lib/system/nuttx/device.c b/lib/system/nuttx/device.c
index 7e66ab33..2c828ab9 100644
--- a/lib/system/nuttx/device.c
+++ b/lib/system/nuttx/device.c
@@ -13,5 +13,6 @@
 
 int metal_generic_dev_sys_open(struct metal_device *dev)
 {
+	metal_unused(dev);
 	return 0;
 }
diff --git a/lib/system/nuttx/init.c b/lib/system/nuttx/init.c
index 8d59784e..2519dc6c 100644
--- a/lib/system/nuttx/init.c
+++ b/lib/system/nuttx/init.c
@@ -19,6 +19,7 @@ int metal_sys_init(const struct metal_init_params *params)
 {
 	int ret = metal_cntr_irq_init();
 
+	metal_unused(params);
 	if (ret >= 0)
 		ret = metal_bus_register(&metal_generic_bus);
 	return ret;
diff --git a/lib/system/nuttx/io.c b/lib/system/nuttx/io.c
index ab9bc6ab..41697a7b 100644
--- a/lib/system/nuttx/io.c
+++ b/lib/system/nuttx/io.c
@@ -15,6 +15,7 @@ static uint64_t metal_io_read_(struct metal_io_region *io,
 {
 	uint64_t value = 0;
 
+	metal_unused(order);
 	metal_io_block_read(io, offset, &value, width);
 	return value;
 }
@@ -25,6 +26,7 @@ static void metal_io_write_(struct metal_io_region *io,
 			    memory_order order,
 			    int width)
 {
+	metal_unused(order);
 	metal_io_block_write(io, offset, &value, width);
 }
 
@@ -36,6 +38,7 @@ static int metal_io_block_read_(struct metal_io_region *io,
 {
 	void *va = metal_io_virt(io, offset);
 
+	metal_unused(order);
 	metal_cache_invalidate(va, len);
 	if (len == 1)
 		*(uint8_t *)dst = *(uint8_t *)va;
@@ -60,6 +63,7 @@ static int metal_io_block_write_(struct metal_io_region *io,
 {
 	void *va = metal_io_virt(io, offset);
 
+	metal_unused(order);
 	if (len == 1)
 		*(uint8_t *)va = *(uint8_t *)src;
 	else if (len == 2)
@@ -85,12 +89,14 @@ static void metal_io_block_set_(struct metal_io_region *io,
 {
 	void *va = metal_io_virt(io, offset);
 
+	metal_unused(order);
 	memset(va, value, len);
 	metal_cache_flush(va, len);
 }
 
 static void metal_io_close_(struct metal_io_region *io)
 {
+	metal_unused(io);
 }
 
 static metal_phys_addr_t metal_io_offset_to_phys_(struct metal_io_region *io,
diff --git a/lib/system/nuttx/io.h b/lib/system/nuttx/io.h
index 7f6508d0..743b7b19 100644
--- a/lib/system/nuttx/io.h
+++ b/lib/system/nuttx/io.h
@@ -16,6 +16,8 @@
 #ifndef __METAL_NUTTX_IO__H__
 #define __METAL_NUTTX_IO__H__
 
+#include <metal/utilities.h>
+
 #ifdef __cplusplus
 extern "C" {
 #endif
@@ -39,6 +41,7 @@ struct metal_io_region *metal_io_get_region(void);
  */
 static inline void metal_sys_io_mem_map(struct metal_io_region *io)
 {
+	metal_unused(io);
 }
 #endif