diff --git a/vpx_ports/vpx_ports.mk b/vpx_ports/vpx_ports.mk
--- a/vpx_ports/vpx_ports.mk
+++ b/vpx_ports/vpx_ports.mk
@@ -23,17 +23,17 @@ ifeq ($(VPX_ARCH_X86),yes)
 PORTS_SRCS-$(HAVE_MMX) += emms_mmx.c
 endif
 ifeq ($(VPX_ARCH_X86_64),yes)
 # Visual Studio x64 does not support the _mm_empty() intrinsic.
 PORTS_SRCS-$(HAVE_MMX) += emms_mmx.asm
 endif
 
 ifeq ($(VPX_ARCH_X86_64),yes)
-PORTS_SRCS-$(CONFIG_MSVS) += float_control_word.asm
+PORTS_SRCS-yes += float_control_word.asm
 endif
 
 ifeq ($(VPX_ARCH_X86)$(VPX_ARCH_X86_64),yes)
 PORTS_SRCS-yes += x86.h
 PORTS_SRCS-yes += x86_abi_support.asm
 endif
 
 PORTS_SRCS-$(VPX_ARCH_ARM) += arm_cpudetect.c