diff --git a/modules/prompt/init.zsh b/modules/prompt/init.zsh
index 2ee8f3a..abe443c 100644
--- a/modules/prompt/init.zsh
+++ b/modules/prompt/init.zsh
@@ -2,7 +2,7 @@
 # load user-defined prompt
 #
 
-if [[ ! ${TERM} == (linux|*bsd*|dumb) ]] && [[ ${zprompt_theme} ]]; then
+if [[ ! ${TERM} == (linux|*bsd*|dumb) ]] && (( ${+zprompt_theme} )); then
   autoload -Uz promptinit && promptinit
   prompt ${zprompt_theme}
 fi