1 files changed, 4 insertions, 0 deletions
diff --git a/io.c b/io.c
index 5abf1e241d..8d78d17e05 100644
--- a/io.c
+++ b/io.c
@@ -1925,6 +1925,10 @@ rb_io_fsync(VALUE io)
 
     if (io_fflush(fptr) < 0)
         rb_sys_fail(0);
+# ifndef _WIN32
+    if ((int)rb_thread_io_blocking_region(nogvl_fsync, fptr, fptr->fd) < 0)
+	rb_sys_fail_path(fptr->pathv);
+# endif
     return INT2FIX(0);
 }
 #else