diff --git a/.config/zsh/functions.zsh b/.config/zsh/functions.zsh
index c355efa..2da1ae3 100644
--- a/.config/zsh/functions.zsh
+++ b/.config/zsh/functions.zsh
@@ -31,11 +31,12 @@ function export-emacs
 # Highlight cat output with whatever less is using for highlighting
 function cat-highlight()
 {
-    if [[ -t 1 ]]; then         # We're in a terminal
+    # Check if we are in a terminal and $LESSOPEN is not empty
+    if [[ -t 1 && -n "${LESSOPEN}" ]]; then
         CATOPEN="${LESSOPEN/| }"
         CATOPEN="${CATOPEN/ %s}"
-        cat $@ | eval ${CATOPEN}
+        \cat $@ | eval ${CATOPEN}
     else
-        cat $@
+        \cat $@
     fi
 }