diff --git a/target/linux/rb532/files/arch/mips/rb500/prom.c b/target/linux/rb532/files/arch/mips/rb500/prom.c
index e6ac24344..45c6e63a1 100644
--- a/target/linux/rb532/files/arch/mips/rb500/prom.c
+++ b/target/linux/rb532/files/arch/mips/rb500/prom.c
@@ -103,9 +103,9 @@ void __init prom_init(void)
 	add_memory_region(ddr->ddrbase + 0x400, memsize - 0x600, BOOT_MEM_RAM);
 }
 
-void prom_free_prom_memory(void)
+void __init prom_free_prom_memory(void)
 {
-	/* FIXME: STUB */
+	/* No prom memory to free */
 }
 
 extern char _image_cmdline;