diff --git a/php-fpm/Dockerfile-56 b/php-fpm/Dockerfile-56
index 4fd449a..3290ff1 100644
--- a/php-fpm/Dockerfile-56
+++ b/php-fpm/Dockerfile-56
@@ -302,11 +302,11 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
 #####################################
 ARG INSTALL_MSSQL=false
 ENV INSTALL_MSSQL ${INSTALL_MSSQL}
-
-RUN if [ ${INSTALL_MSSQL} = true ]; then \
-    apt-get -y install php5-sybase freetds-bin && \
-    cp /usr/lib/php5/20131226/*.so /usr/local/lib/php/extensions/no-debug-non-zts-20131226/ && \
-    docker-php-ext-enable mssql pdo pdo_dblib \
+RUN set -eux; if [ ${INSTALL_MSSQL} = true ]; then \
+    apt-get -y install php5-sybase freetds-bin \
+    && cp /usr/lib/php5/20131226/*.so /usr/local/lib/php/extensions/no-debug-non-zts-20131226/ \
+    && docker-php-ext-enable pdo_dblib mssql \
+    && php -m | grep -q 'mssql' \
 ;fi
 
 #####################################
diff --git a/php-fpm/Dockerfile-70 b/php-fpm/Dockerfile-70
index b1d045e..281a64f 100644
--- a/php-fpm/Dockerfile-70
+++ b/php-fpm/Dockerfile-70
@@ -308,26 +308,27 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
 #####################################
 # SQL SERVER:
 #####################################
-
 ARG INSTALL_MSSQL=false
 ENV INSTALL_MSSQL ${INSTALL_MSSQL}
-RUN if [ ${INSTALL_MSSQL} = true ]; then \
+RUN set -eux; if [ ${INSTALL_MSSQL} = true ]; then \
     #####################################
     # Ref from https://github.com/Microsoft/msphpsql/wiki/Dockerfile-for-adding-pdo_sqlsrv-and-sqlsrv-to-official-php-image
     #####################################
     # Add Microsoft repo for Microsoft ODBC Driver 13 for Linux
     apt-get update -yqq \
-        && apt-get install -y apt-transport-https \
-        && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
-        && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
-        && apt-get update -yqq \
+    && apt-get install -y apt-transport-https \
+    && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
+    && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
+    && apt-get update -yqq \
     # Install Dependencies
-        && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
-        && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
-        && locale-gen \
+    && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
+    && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
+    && locale-gen \
     # Install pdo_sqlsrv and sqlsrv from PECL. Replace pdo_sqlsrv-4.1.8preview with preferred version.
-        && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
-        && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
+    && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && php -m | grep -q 'pdo_sqlsrv' \
+    && php -m | grep -q 'sqlsrv' \
 ;fi
 
 #####################################
diff --git a/php-fpm/Dockerfile-71 b/php-fpm/Dockerfile-71
index 78b7e53..d87584c 100644
--- a/php-fpm/Dockerfile-71
+++ b/php-fpm/Dockerfile-71
@@ -308,24 +308,27 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
 #####################################
 # SQL SERVER:
 #####################################
-
 ARG INSTALL_MSSQL=false
 ENV INSTALL_MSSQL ${INSTALL_MSSQL}
-RUN if [ ${INSTALL_MSSQL} = true ]; then \
+RUN set -eux; if [ ${INSTALL_MSSQL} = true ]; then \
     #####################################
     # Ref from https://github.com/Microsoft/msphpsql/wiki/Dockerfile-for-adding-pdo_sqlsrv-and-sqlsrv-to-official-php-image
     #####################################
     # Add Microsoft repo for Microsoft ODBC Driver 13 for Linux
-    apt-get update -yqq && apt-get install -y apt-transport-https \
-        && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
-        && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
-        && apt-get update -yqq \
+    apt-get update -yqq \
+    && apt-get install -y apt-transport-https \
+    && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
+    && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
+    && apt-get update -yqq \
     # Install Dependencies
-        && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
-        && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && locale-gen \
+    && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
+    && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
+    && locale-gen \
     # Install pdo_sqlsrv and sqlsrv from PECL. Replace pdo_sqlsrv-4.1.8preview with preferred version.
-        && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
-        && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
+    && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && php -m | grep -q 'pdo_sqlsrv' \
+    && php -m | grep -q 'sqlsrv' \
 ;fi
 
 #####################################
diff --git a/php-fpm/Dockerfile-72 b/php-fpm/Dockerfile-72
index 073af76..c9ea138 100644
--- a/php-fpm/Dockerfile-72
+++ b/php-fpm/Dockerfile-72
@@ -311,26 +311,27 @@ RUN if [ ${INSTALL_LDAP} = true ]; then \
 #####################################
 # SQL SERVER:
 #####################################
-
 ARG INSTALL_MSSQL=false
 ENV INSTALL_MSSQL ${INSTALL_MSSQL}
-RUN if [ ${INSTALL_MSSQL} = true ]; then \
+RUN set -eux; if [ ${INSTALL_MSSQL} = true ]; then \
     #####################################
     # Ref from https://github.com/Microsoft/msphpsql/wiki/Dockerfile-for-adding-pdo_sqlsrv-and-sqlsrv-to-official-php-image
     #####################################
     # Add Microsoft repo for Microsoft ODBC Driver 13 for Linux
-    apt-get update -yqq && apt-get install -y apt-transport-https gnupg \
-        && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
-        && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
-        && apt-get update -yqq \
-
+    apt-get update -yqq \
+    && apt-get install -y apt-transport-https gnupg \
+    && curl https://packages.microsoft.com/keys/microsoft.asc | apt-key add - \
+    && curl https://packages.microsoft.com/config/debian/8/prod.list > /etc/apt/sources.list.d/mssql-release.list \
+    && apt-get update -yqq \
     # Install Dependencies
-        && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
-        && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen && locale-gen \
-
+    && ACCEPT_EULA=Y apt-get install -y unixodbc unixodbc-dev libgss3 odbcinst msodbcsql locales \
+    && echo "en_US.UTF-8 UTF-8" > /etc/locale.gen \
+    && locale-gen \
     # Install pdo_sqlsrv and sqlsrv from PECL. Replace pdo_sqlsrv-4.1.8preview with preferred version.
-        && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
-        && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && pecl install pdo_sqlsrv-4.1.8preview sqlsrv-4.1.8preview \
+    && docker-php-ext-enable pdo_sqlsrv sqlsrv \
+    && php -m | grep -q 'pdo_sqlsrv' \
+    && php -m | grep -q 'sqlsrv' \
 ;fi
 
 #####################################