diff --git a/php-fpm/Dockerfile-71 b/php-fpm/Dockerfile-71
index bc3079f2..35e2cfca 100644
--- a/php-fpm/Dockerfile-71
+++ b/php-fpm/Dockerfile-71
@@ -207,7 +207,7 @@ RUN if [ ${INSTALL_INTL} = true ]; then \
 #####################################
 
 ARG INSTALL_GHOSTSCRIPT=false
-RUN if [ ${GHOSTSCRIPT} = true ]; then \
+RUN if [ ${INSTALL_GHOSTSCRIPT} = true ]; then \
     # Install the ghostscript extension
     # for PDF editing
     apt-get -y update \