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-rw-r--r--src/libutil/util.hh4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/libutil/util.hh b/src/libutil/util.hh
index 837382433af9..90132da73317 100644
--- a/src/libutil/util.hh
+++ b/src/libutil/util.hh
@@ -12,6 +12,10 @@
 
 #include <cstdio>
 
+#ifndef HAVE_FDATASYNC
+#define fdatasync fsync
+#endif
+
 
 namespace nix {