diff --git a/ulib/uinst b/ulib/uinst
index 284915f..5276886 100644
--- a/ulib/uinst
+++ b/ulib/uinst
@@ -729,6 +729,7 @@ function __uinst_udir2s() {
     for __uinst_var in "${__uinst_arrays[@]}"; do
         set_array_cmd "$__uinst_var" >>"$__uinst_config"
     done
+    set_var_cmd "UINST_ISTMPDIR" "$UINST_ISTMPDIR" >>"$__uinst_config"
     set_var_cmd "UINST_ORIGSRC" "$UINST_ORIGSRC" >>"$__uinst_config"
     set_var_cmd "UINST_SRCDIR" "$UINST_SRCDIR" >>"$__uinst_config"
     set_var_cmd "ULIBDIR" "$ULIBDIR" >>"$__uinst_config"
@@ -1107,6 +1108,7 @@ function __uinst_python() {
     for __uinst_var in srcdir; do
         set_var_cmd "$__uinst_var" "${!__uinst_var}" >>"$__uinst_config"
     done
+    set_var_cmd "UINST_ISTMPDIR" "$UINST_ISTMPDIR" >>"$__uinst_config"
     set_var_cmd "UINST_ORIGSRC" "$UINST_ORIGSRC" >>"$__uinst_config"
     set_var_cmd "UINST_SRCDIR" "$UINST_SRCDIR" >>"$__uinst_config"
     set_var_cmd "ULIBDIR" "$ULIBDIR" >>"$__uinst_config"
@@ -1222,6 +1224,7 @@ function __uinst_file() {
     for __uinst_var in files modes; do
         set_array_cmd "$__uinst_var" >>"$__uinst_config"
     done
+    set_var_cmd "UINST_ISTMPDIR" "$UINST_ISTMPDIR" >>"$__uinst_config"
     set_var_cmd "UINST_ORIGSRC" "$UINST_ORIGSRC" >>"$__uinst_config"
     set_var_cmd "UINST_SRCDIR" "$UINST_SRCDIR" >>"$__uinst_config"
     set_var_cmd "ULIBDIR" "$ULIBDIR" >>"$__uinst_config"