diff --git a/Objects/mimalloc/prim/unix/prim.c b/Objects/mimalloc/prim/unix/prim.c
index c4816af1a0d6e5..4d3fb65e954407 100644
--- a/Objects/mimalloc/prim/unix/prim.c
+++ b/Objects/mimalloc/prim/unix/prim.c
@@ -51,7 +51,7 @@ terms of the MIT license. A copy of the license can be found in the file
   #include <sys/sysctl.h>
 #endif
 
-#if !defined(__HAIKU__) && !defined(__APPLE__) && !defined(__CYGWIN__) && !defined(_AIX) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun)
+#if !defined(__HAIKU__) && !defined(__APPLE__) && !defined(__CYGWIN__) && !defined(_AIX) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun) && !defined(__NetBSD__)
   #define MI_HAS_SYSCALL_H
   #include <sys/syscall.h>
 #endif
@@ -77,7 +77,7 @@ static int mi_prim_access(const char *fpath, int mode) {
   return syscall(SYS_access,fpath,mode);
 }
 
-#elif !defined(__APPLE__) && !defined(_AIX) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun) // avoid unused warnings
+#elif !defined(__APPLE__) && !defined(_AIX) && !defined(__OpenBSD__) && !defined(__FreeBSD__) && !defined(__sun) && !defined(__NetBSD__) // avoid unused warnings
 
 static int mi_prim_open(const char* fpath, int open_flags) {
   return open(fpath,open_flags);