diff --git a/modules/environment/init.zsh b/modules/environment/init.zsh
index 36810ee..52aab18 100644
--- a/modules/environment/init.zsh
+++ b/modules/environment/init.zsh
@@ -39,7 +39,7 @@ unsetopt HUP
 unsetopt CHECK_JOBS
 
 # Set less or more as the default pager.
-if [[ -z ${PAGER} ]]; then
+if (( ! ${+PAGER} )); then
   if (( ${+commands[less]} )); then
     export PAGER=less
   else