diff --git a/src/epics/util/feCodeGen.pl b/src/epics/util/feCodeGen.pl
index 0c68accab46dda41e8d940fad6d9352ee70ce780..f104421cd8b30ed2f6c81bac0ee5a33dbe5b46ec 100644
--- a/src/epics/util/feCodeGen.pl
+++ b/src/epics/util/feCodeGen.pl
@@ -70,6 +70,7 @@ $currWorkDir = &Cwd::cwd();
 $rcg_src_dir = $ENV{"RCG_SRC_DIR"};
 $mbufsymfile = $ENV{"MBUFSYM"};
 $gpssymfile = $ENV{"GPSSYM"};
+$cpuisolatorfile = $ENV{"CPUISOSYM"};
 $dolphinGen = 2;
 
 if (! length $rcg_src_dir) { $rcg_src_dir = "$currWorkDir/../../.."; }