diff --git a/arch/ppc/kernel/perfmon.c b/arch/ppc/kernel/perfmon.c
index 04c18788e85f..22df9a596a0f 100644
--- a/arch/ppc/kernel/perfmon.c
+++ b/arch/ppc/kernel/perfmon.c
@@ -45,9 +45,8 @@ static void dummy_perf(struct pt_regs *regs)
 	mtpmr(PMRN_PMGC0, pmgc0);
 }
 
-#elif CONFIG_6xx
+#elif defined(CONFIG_6xx)
 /* Ensure exceptions are disabled */
-
 static void dummy_perf(struct pt_regs *regs)
 {
 	unsigned int mmcr0 = mfspr(SPRN_MMCR0);