diff --git a/libretro-common/features/features_cpu.c b/libretro-common/features/features_cpu.c
index 6c9176be84..efccf93070 100644
--- a/libretro-common/features/features_cpu.c
+++ b/libretro-common/features/features_cpu.c
@@ -649,7 +649,7 @@ uint64_t cpu_features_get(void)
    if (sysctlbyname("hw.optional.neon", NULL, &len, NULL, 0) == 0)
       cpu |= RETRO_SIMD_NEON;
 
-#elif defined(XBOX1)
+#elif defined(_XBOX1)
    cpu |= RETRO_SIMD_MMX;
    cpu |= RETRO_SIMD_SSE;
    cpu |= RETRO_SIMD_MMXEXT;