diff --git a/tools/include/nolibc/sys.h b/tools/include/nolibc/sys.h
index b8c96878c9ce0b4f0aa468611a400d2108c861a8..ce3ee03aa6794b484e98c93ba4f4addca62e06d0 100644
--- a/tools/include/nolibc/sys.h
+++ b/tools/include/nolibc/sys.h
@@ -697,7 +697,7 @@ void *sys_mmap(void *addr, size_t length, int prot, int flags, int fd,
 
 	int n;
 
-#if defined(__i386__)
+#if defined(__NR_mmap2)
 	n = __NR_mmap2;
 	offset >>= 12;
 #else