diff --git a/src/backends/unix/shared/hunk.c b/src/backends/unix/shared/hunk.c
index 1a2af9cd..568fdd80 100644
--- a/src/backends/unix/shared/hunk.c
+++ b/src/backends/unix/shared/hunk.c
@@ -97,6 +97,8 @@ Hunk_End(void)
 
 #if defined(__linux__)
 	n = (byte *)mremap(membase, maxhunksize, curhunksize + sizeof(size_t), 0);
+#elif defined(__NetBSD__)
+	n = (byte *)mremap(membase, maxhunksize, NULL, curhunksize + sizeof(size_t), 0);
 #else
  #ifndef round_page
  size_t page_size = sysconf(_SC_PAGESIZE);