diff --git a/include/asm-mips/mach-rm/mc146818rtc.h b/include/asm-mips/mach-rm/mc146818rtc.h
index 103ae8ef590a..145bce096fe9 100644
--- a/include/asm-mips/mach-rm/mc146818rtc.h
+++ b/include/asm-mips/mach-rm/mc146818rtc.h
@@ -10,7 +10,7 @@
 #ifndef __ASM_MACH_RM_MC146818RTC_H
 #define __ASM_MACH_RM_MC146818RTC_H
 
-#if CONFIG_CPU_BIG_ENDIAN
+#ifdef CONFIG_CPU_BIG_ENDIAN
 #define mc146818_decode_year(year) ((year) < 70 ? (year) + 2000 : (year) + 1900)
 #else
 #define mc146818_decode_year(year) ((year) + 1980)