diff --git a/arch/x86_64/src/intel64/Make.defs b/arch/x86_64/src/intel64/Make.defs
index c17c07a0018..5c60bc0ab9f 100644
--- a/arch/x86_64/src/intel64/Make.defs
+++ b/arch/x86_64/src/intel64/Make.defs
@@ -34,7 +34,7 @@ CHIP_CSRCS  = intel64_start.c intel64_handlers.c intel64_idle.c intel64_lowsetup
 CHIP_CSRCS += intel64_serial.c intel64_rng.c intel64_check_capability.c
 CHIP_CSRCS += intel64_cpu.c
 
-ifeq ($(CONFIG_x86_64_UNWINDER_FRAME_POINTER),y)
+ifeq ($(CONFIG_X86_64_UNWINDER_FRAME_POINTER),y)
   CMN_CSRCS += intel64_backtrace_fp.c
 endif