diff --git a/hdf-4.2r1p4-maxavailfiles.patch b/hdf-4.2r1p4-maxavailfiles.patch
index 9afa15d..8ff4f0c 100644
--- a/hdf-4.2r1p4-maxavailfiles.patch
+++ b/hdf-4.2r1p4-maxavailfiles.patch
@@ -5,7 +5,7 @@
  /* Maximum number of files can be opened at one time; subtract 3 from
     the system allowed to account for stdin, stdout, and stderr */
 -#define MAX_AVAIL_OPENFILES          (MAX_SYS_OPENFILES - 3)
-+#define MAX_AVAIL_OPENFILES          (MAX_SYS_OPENFILES - 10)
++#define MAX_AVAIL_OPENFILES          (MAX_SYS_OPENFILES - 12)
  
  static int _ncdf = 0 ; /*  high water mark on open cdf's */
  static NC **_cdfs;