1 files changed, 8 insertions, 0 deletions
diff --git a/io.c b/io.c
index fbd24f6046..137bc77fb1 100644
--- a/io.c
+++ b/io.c
@@ -1533,6 +1533,10 @@ nogvl_fsync(void *ptr)
 {
     rb_io_t *fptr = ptr;
 
+#ifdef _WIN32
+    if (GetFileType((HANDLE)rb_w32_get_osfhandle(fptr->fd)) != FILE_TYPE_DISK)
+	return 0;
+#endif
     return (VALUE)fsync(fptr->fd);
 }
 #endif
@@ -1935,6 +1939,10 @@ nogvl_fdatasync(void *ptr)
 {
     rb_io_t *fptr = ptr;
 
+#ifdef _WIN32
+    if (GetFileType((HANDLE)rb_w32_get_osfhandle(fptr->fd)) != FILE_TYPE_DISK)
+	return 0;
+#endif
     return (VALUE)fdatasync(fptr->fd);
 }