diff --git a/arch/arm/mach-stm32mp/spl.c b/arch/arm/mach-stm32mp/spl.c
index 19d9fe0..6c79259 100644
--- a/arch/arm/mach-stm32mp/spl.c
+++ b/arch/arm/mach-stm32mp/spl.c
@@ -112,7 +112,7 @@
 
 static int optee_get_reserved_memory(uint32_t *start, uint32_t *size)
 {
-	phys_size_t fdt_mem_size;
+	fdt_addr_t fdt_mem_size;
 	fdt_addr_t fdt_start;
 	ofnode node;