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-rw-r--r--Src/Modules/mapfile.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/Src/Modules/mapfile.c b/Src/Modules/mapfile.c
index 41cae80b8..31265c0de 100644
--- a/Src/Modules/mapfile.c
+++ b/Src/Modules/mapfile.c
@@ -143,6 +143,9 @@ setpmmapfile(Param pm, char *value)
 	 */
 	ftruncate(fd, len);
 	memcpy(mmptr, value, len);
+#ifndef MS_SYNC
+#define MS_SYNC 0
+#endif
 	msync(mmptr, len, MS_SYNC);
 	/*
 	 * Then we need to truncate again, since mmap() always maps complete