diff --git a/arch/arm/src/lpc17xx_40xx/Make.defs b/arch/arm/src/lpc17xx_40xx/Make.defs
index 72c63e532cb..016a281549d 100644
--- a/arch/arm/src/lpc17xx_40xx/Make.defs
+++ b/arch/arm/src/lpc17xx_40xx/Make.defs
@@ -31,7 +31,7 @@ CMN_CSRCS += arm_releasestack.c arm_reprioritizertr.c arm_schedulesigaction.c
 CMN_CSRCS += arm_sigdeliver.c arm_stackframe.c arm_trigger_irq.c
 CMN_CSRCS += arm_unblocktask.c arm_usestack.c arm_doirq.c arm_hardfault.c
 CMN_CSRCS += arm_svcall.c arm_checkstack.c arm_vfork.c arm_switchcontext.c
-CMN_CSRCS += arm_systemreset.c arm_puts.c arm_tcbinfo.c
+CMN_CSRCS += arm_systemreset.c arm_puts.c arm_tcbinfo.c arm_perf.c
 
 ifeq ($(CONFIG_SCHED_BACKTRACE),y)
 CMN_CSRCS += arm_backtrace_thumb.c
diff --git a/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_boardinitialize.c b/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_boardinitialize.c
index f0110c6b854..367bf6a41df 100644
--- a/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_boardinitialize.c
+++ b/boards/arm/lpc17xx_40xx/lx_cpu/src/lpc17_40_boardinitialize.c
@@ -51,6 +51,10 @@
 
 void lpc17_40_boardinitialize(void)
 {
+#ifdef CONFIG_SCHED_IRQMONITOR
+  up_perf_init((FAR void *)LPC17_40_CCLK);
+#endif
+
   /* Initialize the EMC, and SDRAM */
 
 #ifndef BOARD_EMC_CONFIG_BY_LOADER