diff --git a/themes/powerline/powerline.base.bash b/themes/powerline/powerline.base.bash
index dff870cb..f65e9dd6 100644
--- a/themes/powerline/powerline.base.bash
+++ b/themes/powerline/powerline.base.bash
@@ -2,6 +2,7 @@
 THEME_CHECK_SUDO=${THEME_CHECK_SUDO:=true}
 
 function set_color {
+  set +u
   if [[ "${1}" != "-" ]]; then
     fg="38;5;${1}"
   fi
@@ -13,6 +14,7 @@ function set_color {
 }
 
 function __powerline_user_info_prompt {
+  set +u
   local user_info=""
   local color=${USER_INFO_THEME_PROMPT_COLOR}
 
@@ -51,6 +53,7 @@ function __powerline_ruby_prompt {
 }
 
 function __powerline_python_venv_prompt {
+  set +u
   local python_venv=""
 
   if [[ -n "${CONDA_DEFAULT_ENV}" ]]; then