1 files changed, 5 insertions, 0 deletions

diff --git a/src/arch/avx2.h b/src/arch/avx2.h
index 801419e..5b9ecc7 100644
--- a/src/arch/avx2.h
+++ b/src/arch/avx2.h
@@ -1,3 +1,6 @@
+#ifndef ARCH_AVX2_H
+#define ARCH_AVX2_H
+
 #define CO2_AVX2 _mm256_set_epi64x(0, 0, 0, INT64_C(0x6060606060606060))
 #define COCW_AVX2 _mm256_set_epi64x(0, 0, 0, INT64_C(0x2020202020202020))
 #define CP_AVX2 _mm256_set_epi64x(0, 0, 0, INT64_C(0x0707070707070707))
@@ -478,3 +481,5 @@ invcoord_epudsep(uint64_t i)
 
         return _mm256_or_si256(elow, cube);
 }
+
+#endif /* ARCH_AVX2_H */