diff --git a/ConflictSet.cpp b/ConflictSet.cpp
index 6c260a2..d15a572 100644
--- a/ConflictSet.cpp
+++ b/ConflictSet.cpp
@@ -1673,7 +1673,7 @@ int firstNeqStride(const uint8_t *ap, const uint8_t *bp) {
 #endif
 }
 
-#if defined(__x86_64__) && !defined(__SANITIZE_THREAD__)
+#if defined(HAS_AVX) && !defined(__SANITIZE_THREAD__)
 __attribute__((target("avx512bw"))) int
 longestCommonPrefix(const uint8_t *ap, const uint8_t *bp, int cl) {
   int i = 0;