diff --git a/ShellB3/shallbethree.sh b/ShellB3/shallbethree.sh
index 557241f76929b4041b08821040ff13244fb06676..72149c52ae1c0c0a5fe9ec22a46488861e42f431 100755
--- a/ShellB3/shallbethree.sh
+++ b/ShellB3/shallbethree.sh
@@ -535,7 +535,7 @@ export PYGRIBVER=2.0.1
 
 export PYPROJVER=1.9.5.1
 export SZIPVER=2.1
-export HDF5VER=1.8.17    # also may come in from system or $COTS_HOME
+export HDF5VER=1.8.11    # also may come in from system or $COTS_HOME
 export H5PYVER=2.6.0
 
 export CYTHONVER=0.24