diff --git a/configure.ac b/configure.ac
index b358a666a75..eaf38d5497a 100644
--- a/configure.ac
+++ b/configure.ac
@@ -548,6 +548,7 @@ asctime_r \
 chroot \
 ctime_r \
 explicit_memset \
+fdatasync \
 flock \
 ftok \
 funopen \
diff --git a/main/streams/plain_wrapper.c b/main/streams/plain_wrapper.c
index 1fdafa8b933..86adb9c91be 100644
--- a/main/streams/plain_wrapper.c
+++ b/main/streams/plain_wrapper.c
@@ -58,6 +58,9 @@ extern int php_get_gid_by_name(const char *name, gid_t *gid);
 #define fdatasync fsync
 #else
 # define PLAIN_WRAP_BUF_SIZE(st) (st)
+# if !defined(HAVE_FDATASYNC)
+#  define fdatasync fsync
+# endif
 #endif
 
 /* parse standard "fopen" modes into open() flags */