diff --git a/setup.sh b/setup.sh
index f33c744..a981f00 100644
--- a/setup.sh
+++ b/setup.sh
@@ -544,7 +544,7 @@ sed -i -e "s%${tag_dhparam}%${DHPath}%" "${configPath}/${file_mozmodern}"
 sed -i -e "s%${tag_cachain}%${CAChainPath}%" "${configPath}/${file_mozmodern}"
 
 # if using PHP: process buffers.conf
-if [ ${usePHP} -eq 1 ]; then
+if [ "${usePHP}" -eq 1 ]; then
     echo "updating ${warn}${configPath}/${file_buffers}${norm}"
     cat "${configPath}/${file_buffersPHP}" >> "${configPath}/${file_buffers}"
 fi