diff --git a/samplib/ZWESLSTC b/samplib/ZWESLSTC
index 2594052..0659907 100644
--- a/samplib/ZWESLSTC
+++ b/samplib/ZWESLSTC
@@ -55,7 +55,7 @@
 //********************************************************************/
 //STDENV   DD  *
 _CEE_ENVFILE_CONTINUATION=\
-_CEE_RUNOPTS=HEAPPOOLS(OFF)
+_CEE_RUNOPTS=HEAPPOOLS(OFF),HEAPPOOLS64(OFF)
 _EDC_UMASK_DFLT=0002
 CONFIG=#zowe_yaml
 /*