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-rw-r--r--src/include/port/win32_port.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/include/port/win32_port.h b/src/include/port/win32_port.h
index 5ea66528fad..4de5bf3bf60 100644
--- a/src/include/port/win32_port.h
+++ b/src/include/port/win32_port.h
@@ -87,7 +87,9 @@
* We have a replacement for fdatasync() in src/port/fdatasync.c, which is
* unconditionally used by MSVC and Mingw builds.
*/
+#ifndef HAVE_FDATASYNC
#define HAVE_FDATASYNC
+#endif
#define USES_WINSOCK