diff --git a/src/crypto/tree-hash.c b/src/crypto/tree-hash.c
index b700e64a..2909f319 100644
--- a/src/crypto/tree-hash.c
+++ b/src/crypto/tree-hash.c
@@ -8,8 +8,9 @@
 #include <string.h>
 
 #include "hash-ops.h"
-#include "malloc.h"
-
+#ifdef _M_ARM64
+  #include "malloc.h"
+#endif 
 void tree_hash(const char (*hashes)[HASH_SIZE], size_t count, char *root_hash) {
   assert(count > 0);
   if (count == 1) {