diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index a642cd8..cf27e94 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -15,7 +15,7 @@ limitations under the License.
 */
 
 #if !defined(USE_SIMD_FALLBACK) && defined(__has_include)
-#if __has_include("immintrin.h")
+#if defined(__x86_64__) && __has_include("immintrin.h")
 #define HAS_AVX 1
 #include <immintrin.h>
 #elif __has_include("arm_neon.h")