diff --git a/arch/mips/cobalt/setup.c b/arch/mips/cobalt/setup.c
index e8f0f20..a4b69b5 100644
--- a/arch/mips/cobalt/setup.c
+++ b/arch/mips/cobalt/setup.c
@@ -204,8 +204,7 @@
 	add_memory_region(0x0, memsz, BOOT_MEM_RAM);
 }
 
-unsigned long __init prom_free_prom_memory(void)
+void __init prom_free_prom_memory(void)
 {
 	/* Nothing to do! */
-	return 0;
 }