1 files changed, 3 insertions, 3 deletions
diff --git a/pngwio.c b/pngwio.c
index 1afbe9391..2dedb8b80 100644
--- a/pngwio.c
+++ b/pngwio.c
@@ -1,9 +1,9 @@
 
 /* pngwio.c - functions for data output
  *
- * Last changed in libpng 1.2.30 [August 15, 2008]
+ * Last changed in libpng 1.2.35 [February 12, 2009]
  * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2009 Glenn Randers-Pehrson
  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
  *
@@ -137,7 +137,7 @@ png_default_flush(png_structp png_ptr)
    if (png_ptr == NULL) return;
 #if !defined(_WIN32_WCE)
    io_ptr = (png_FILE_p)CVT_PTR((png_ptr->io_ptr));
-   if (io_ptr != NULL)
+   if (io_ptr != NULL && fileno(io_ptr) != -1)
       fflush(io_ptr);
 #endif
 }