diff --git a/workspace/Dockerfile-56 b/workspace/Dockerfile-56
index 73ffd034..42d0256b 100644
--- a/workspace/Dockerfile-56
+++ b/workspace/Dockerfile-56
@@ -133,7 +133,7 @@ ARG INSTALL_XDEBUG=false
 RUN if [ ${INSTALL_XDEBUG} = true ]; then \
     # Load the xdebug extension only with phpunit commands
     apt-get install -y --force-yes php5.6-xdebug && \
-    sed -i 's/^/;/g' /etc/php/5.6/cli/conf.d/20-xdebug.ini && \
+    sed -i 's/^;//g' /etc/php/5.6/cli/conf.d/20-xdebug.ini && \
     echo "alias phpunit='php -dzend_extension=xdebug.so /var/www/vendor/bin/phpunit'" >> ~/.bashrc \
 ;fi
 # ADD for REMOTE debugging
diff --git a/workspace/Dockerfile-70 b/workspace/Dockerfile-70
index ade5d0c4..9c7d5627 100644
--- a/workspace/Dockerfile-70
+++ b/workspace/Dockerfile-70
@@ -133,7 +133,7 @@ ARG INSTALL_XDEBUG=false
 RUN if [ ${INSTALL_XDEBUG} = true ]; then \
     # Load the xdebug extension only with phpunit commands
     apt-get install -y --force-yes php7.0-xdebug && \
-    sed -i 's/^/;/g' /etc/php/7.0/cli/conf.d/20-xdebug.ini && \
+    sed -i 's/^;//g' /etc/php/7.0/cli/conf.d/20-xdebug.ini && \
     echo "alias phpunit='php -dzend_extension=xdebug.so /var/www/vendor/bin/phpunit'" >> ~/.bashrc \
 ;fi
 # ADD for REMOTE debugging
diff --git a/workspace/Dockerfile-71 b/workspace/Dockerfile-71
index e29e2217..71d865b3 100644
--- a/workspace/Dockerfile-71
+++ b/workspace/Dockerfile-71
@@ -129,7 +129,7 @@ ARG INSTALL_XDEBUG=false
 RUN if [ ${INSTALL_XDEBUG} = true ]; then \
     # Load the xdebug extension only with phpunit commands
     apt-get install -y --force-yes php-xdebug && \
-    sed -i 's/^/;/g' /etc/php/7.1/cli/conf.d/20-xdebug.ini && \
+    sed -i 's/^;//g' /etc/php/7.1/cli/conf.d/20-xdebug.ini && \
     echo "alias phpunit='php -dzend_extension=xdebug.so /var/www/vendor/bin/phpunit'" >> ~/.bashrc \
 ;fi
 # ADD for REMOTE debugging