diff --git a/arch/arm/src/lpc17xx_40xx/Make.defs b/arch/arm/src/lpc17xx_40xx/Make.defs
index 81a1515dfc0..b87f5afe1f5 100644
--- a/arch/arm/src/lpc17xx_40xx/Make.defs
+++ b/arch/arm/src/lpc17xx_40xx/Make.defs
@@ -160,6 +160,6 @@ ifeq ($(CONFIG_LPC17_40_TMR0),y)
 CHIP_CSRCS += lpc17_40_timer.c
 endif
 
-ifeq ($(CONFIG_MTD_PROGMEM),y)
+ifeq ($(CONFIG_LPC17_40_PROGMEM),y)
 CHIP_CSRCS += lpc17_40_progmem.c
 endif
diff --git a/arch/arm/src/lpc17xx_40xx/lpc17_40_progmem.c b/arch/arm/src/lpc17xx_40xx/lpc17_40_progmem.c
index b203bdf5ef1..2c4edc1652d 100644
--- a/arch/arm/src/lpc17xx_40xx/lpc17_40_progmem.c
+++ b/arch/arm/src/lpc17xx_40xx/lpc17_40_progmem.c
@@ -74,7 +74,7 @@ static void lpc17_40_iap(FAR void *in, FAR void *out)
 
   flags = enter_critical_section();
 
-  ((void *(FAR void *, FAR void *))LPC17_40_IAP_ENTRY_ADDR)(in, out);
+  ((void (*)(FAR void *, FAR void *))LPC17_40_IAP_ENTRY_ADDR)(in, out);
 
   leave_critical_section(flags);
 }