diff --git a/php-fpm/Dockerfile b/php-fpm/Dockerfile
index fd1de889..51cd1691 100644
--- a/php-fpm/Dockerfile
+++ b/php-fpm/Dockerfile
@@ -203,7 +203,7 @@ RUN if [ ${INSTALL_ZIP_ARCHIVE} = true ]; then \
 ###########################################################################
 
 ARG INSTALL_PCNTL=false
-RUN if [ ${INSTALL_PCNTL} = true]; then \
+RUN if [ ${INSTALL_PCNTL} = true ]; then \
     # Installs pcntl, helpful for running Horizon
     docker-php-ext-install pcntl \
 ;fi