diff --git a/src/include/OpenImageIO/simd.h b/src/include/OpenImageIO/simd.h

index e9ac56bc..75df545a 100644

--- a/src/include/OpenImageIO/simd.h

+++ b/src/include/OpenImageIO/simd.h

@@ -225,15 +225,15 @@

 #  define OIIO_F16C_ENABLED 0

 #endif

-#if defined(__ARM_NEON__) && !defined(OIIO_NO_NEON)

-#  define OIIO_SIMD 4

-#  define OIIO_SIMD_NEON 1

-#  define OIIO_SIMD_MAX_SIZE_BYTES 16

-#  define OIIO_SIMD4_ALIGN OIIO_ALIGN(16)

-#  define OIIO_SSE_ALIGN OIIO_ALIGN(16)

-#else

+//#if defined(__ARM_NEON__) && !defined(OIIO_NO_NEON)

+//#  define OIIO_SIMD 4

+//#  define OIIO_SIMD_NEON 1

+//#  define OIIO_SIMD_MAX_SIZE_BYTES 16

+//#  define OIIO_SIMD4_ALIGN OIIO_ALIGN(16)

+//#  define OIIO_SSE_ALIGN OIIO_ALIGN(16)

+//#else

 #  define OIIO_SIMD_NEON 0

-#endif

+//#endif

 #ifndef OIIO_SIMD

    // No SIMD available