diff --git a/include/efi_api.h b/include/efi_api.h
index d956aee560..d9a69dbc00 100644
--- a/include/efi_api.h
+++ b/include/efi_api.h
@@ -107,7 +107,7 @@ struct efi_boot_services {
 	efi_status_t (EFIAPI *load_image)(bool boot_policiy,
 			efi_handle_t parent_image,
 			struct efi_device_path *file_path, void *source_buffer,
-			unsigned long source_size, efi_handle_t *image);
+			efi_uintn_t source_size, efi_handle_t *image);
 	efi_status_t (EFIAPI *start_image)(efi_handle_t handle,
 					   unsigned long *exitdata_size,
 					   s16 **exitdata);
diff --git a/lib/efi_loader/efi_boottime.c b/lib/efi_loader/efi_boottime.c
index fd35ffa359..d15a131e74 100644
--- a/lib/efi_loader/efi_boottime.c
+++ b/lib/efi_loader/efi_boottime.c
@@ -1568,14 +1568,14 @@ static efi_status_t EFIAPI efi_load_image(bool boot_policy,
 					  efi_handle_t parent_image,
 					  struct efi_device_path *file_path,
 					  void *source_buffer,
-					  unsigned long source_size,
+					  efi_uintn_t source_size,
 					  efi_handle_t *image_handle)
 {
 	struct efi_loaded_image *info;
 	struct efi_object *obj;
 	efi_status_t ret;
 
-	EFI_ENTRY("%d, %p, %pD, %p, %ld, %p", boot_policy, parent_image,
+	EFI_ENTRY("%d, %p, %pD, %p, %zd, %p", boot_policy, parent_image,
 		  file_path, source_buffer, source_size, image_handle);
 
 	if (!image_handle || !parent_image) {