diff --git a/zsh-autosuggestions.zsh b/zsh-autosuggestions.zsh
index b19cac7..aa971ee 100644
--- a/zsh-autosuggestions.zsh
+++ b/zsh-autosuggestions.zsh
@@ -292,7 +292,7 @@ _zsh_autosuggest_toggle() {
 # Clear the suggestion
 _zsh_autosuggest_clear() {
 	# Remove the suggestion
-	unset POSTDISPLAY
+	POSTDISPLAY=
 
 	_zsh_autosuggest_invoke_original_widget $@
 }
@@ -309,7 +309,7 @@ _zsh_autosuggest_modify() {
 	local orig_postdisplay="$POSTDISPLAY"
 
 	# Clear suggestion while waiting for next one
-	unset POSTDISPLAY
+	POSTDISPLAY=
 
 	# Original widget may modify the buffer
 	_zsh_autosuggest_invoke_original_widget $@
@@ -364,7 +364,7 @@ _zsh_autosuggest_suggest() {
 	if [[ -n "$suggestion" ]] && (( $#BUFFER )); then
 		POSTDISPLAY="${suggestion#$BUFFER}"
 	else
-		unset POSTDISPLAY
+		POSTDISPLAY=
 	fi
 }
 
@@ -390,7 +390,7 @@ _zsh_autosuggest_accept() {
 	BUFFER="$BUFFER$POSTDISPLAY"
 
 	# Remove the suggestion
-	unset POSTDISPLAY
+	POSTDISPLAY=
 
 	# Run the original widget before manually moving the cursor so that the
 	# cursor movement doesn't make the widget do something unexpected
@@ -413,7 +413,7 @@ _zsh_autosuggest_execute() {
 	BUFFER="$BUFFER$POSTDISPLAY"
 
 	# Remove the suggestion
-	unset POSTDISPLAY
+	POSTDISPLAY=
 
 	# Call the original `accept-line` to handle syntax highlighting or
 	# other potential custom behavior