diff --git a/docs/getting_started/porting-guide.rst b/docs/getting_started/porting-guide.rst
index 24af13e..be04b97 100644
--- a/docs/getting_started/porting-guide.rst
+++ b/docs/getting_started/porting-guide.rst
@@ -889,7 +889,7 @@
 
 ::
 
-    Argument : struct fwu_metadata *metadata
+    Argument : const struct fwu_metadata *metadata
     Return   : void
 
 This function is mandatory when PSA_FWU_SUPPORT is enabled.
diff --git a/include/plat/common/platform.h b/include/plat/common/platform.h
index 9a61b50..5a8f5a3 100644
--- a/include/plat/common/platform.h
+++ b/include/plat/common/platform.h
@@ -389,6 +389,6 @@
 int plat_fwu_set_metadata_image_source(unsigned int image_id,
 				       uintptr_t *dev_handle,
 				       uintptr_t *image_spec);
-void plat_fwu_set_images_source(struct fwu_metadata *metadata);
+void plat_fwu_set_images_source(const struct fwu_metadata *metadata);
 
 #endif /* PLATFORM_H */
diff --git a/plat/arm/common/arm_io_storage.c b/plat/arm/common/arm_io_storage.c
index 387086a..19ee1b0 100644
--- a/plat/arm/common/arm_io_storage.c
+++ b/plat/arm/common/arm_io_storage.c
@@ -217,7 +217,7 @@
  * bank to get its offset and length, and update these details in the I/O policy
  * of the FIP image.
  ******************************************************************************/
-void plat_fwu_set_images_source(struct fwu_metadata *metadata)
+void plat_fwu_set_images_source(const struct fwu_metadata *metadata)
 {
 	arm_set_fip_addr(metadata->active_index);
 }