diff --git a/etc/config.csh/unset b/etc/config.csh/unset
index bda01ef98d..1c540d6771 100644
--- a/etc/config.csh/unset
+++ b/etc/config.csh/unset
@@ -86,8 +86,9 @@ unsetenv WM_THIRD_PARTY_DIR
 
 unsetenv FOAM_APPBIN
 unsetenv FOAM_APP
-unsetenv FOAM_EXT_LIBBIN
 unsetenv FOAM_CODE_TEMPLATES
+unsetenv FOAM_ETC
+unsetenv FOAM_EXT_LIBBIN
 unsetenv FOAM_INST_DIR
 unsetenv FOAM_JOB_DIR
 unsetenv FOAM_LIBBIN
diff --git a/etc/config.sh/unset b/etc/config.sh/unset
index 75aefc6172..732d90d34e 100644
--- a/etc/config.sh/unset
+++ b/etc/config.sh/unset
@@ -77,8 +77,9 @@ unset WM_THIRD_PARTY_DIR
 
 unset FOAM_APPBIN
 unset FOAM_APP
-unset FOAM_EXT_LIBBIN
 unset FOAM_CODE_TEMPLATES
+unset FOAM_ETC
+unset FOAM_EXT_LIBBIN
 unset FOAM_INST_DIR
 unset FOAM_JOB_DIR
 unset FOAM_LIBBIN