diff --git a/plat/arm/css/drivers/sds/sds.h b/plat/arm/css/drivers/sds/sds.h
index ff3787d..4aef0df 100644
--- a/plat/arm/css/drivers/sds/sds.h
+++ b/plat/arm/css/drivers/sds/sds.h
@@ -80,7 +80,7 @@
 } sds_access_mode_t;
 
 int sds_init(void);
-int sds_struct_exists(uint32_t structure_id);
+int sds_struct_exists(unsigned int structure_id);
 int sds_struct_read(uint32_t structure_id, unsigned int fld_off, void *data,
 		size_t size, sds_access_mode_t mode);
 int sds_struct_write(uint32_t structure_id, unsigned int fld_off, void *data,