diff --git a/arch/arm/src/lpc214x/lpc214x_timerisr.c b/arch/arm/src/lpc214x/lpc214x_timerisr.c
index 4a7bbb6c4f..1c6b9c69af 100644
--- a/arch/arm/src/lpc214x/lpc214x_timerisr.c
+++ b/arch/arm/src/lpc214x/lpc214x_timerisr.c
@@ -59,7 +59,7 @@
  */
 
 #define LPC214X_CCLKFREQ  (LPC214X_FOSC*LPC214X_PLL_M)
-#define LPC214X_PCLKFREQ  (LPC214X_CCLKFREQ/LPC214X_APBDIV)
+#define LPC214X_PCLKFREQ  (LPC214X_CCLKFREQ/LPC214X_APB_DIV)
 
 #define tmr_getreg8(o)    getreg8(LPC214X_TMR0_BASE+(o))
 #define tmr_getreg16(o)   getreg16(LPC214X_TMR0_BASE+(o))