diff --git a/malign_buffer.cc b/malign_buffer.cc
index 5845ffb..f343c4e 100644
--- a/malign_buffer.cc
+++ b/malign_buffer.cc
@@ -127,7 +127,12 @@ void MalignBuffer::InitializeMemoryForSanitizer(char *addr, size_t size) {
 }
 
 const size_t MalignBuffer::kPageSize = sysconf(_SC_PAGESIZE);
+#ifdef _SC_LEVEL1_DCACHE_LINESIZE
 const size_t MalignBuffer::kCacheLineSize = sysconf(_SC_LEVEL1_DCACHE_LINESIZE);
+#else
+// Default to 64 bytes which is common on x86_64
+const size_t MalignBuffer::kCacheLineSize = 64;
+#endif
 
 std::string MalignBuffer::ToString(CopyMethod m) {
   switch (m) {