diff --git a/build/docker/ubuntu-bionic/Dockerfile b/build/docker/ubuntu-bionic/Dockerfile
index 3566199..a0ed317 100644
--- a/build/docker/ubuntu-bionic/Dockerfile
+++ b/build/docker/ubuntu-bionic/Dockerfile
@@ -217,6 +217,7 @@
       php \
       php-cli \
       php-dev \
+      php-json \
       php-pear \
       re2c \
       composer
diff --git a/build/docker/ubuntu-xenial/Dockerfile b/build/docker/ubuntu-xenial/Dockerfile
index 88895a0..5693a2c 100644
--- a/build/docker/ubuntu-xenial/Dockerfile
+++ b/build/docker/ubuntu-xenial/Dockerfile
@@ -218,6 +218,7 @@
       php7.0 \
       php7.0-cli \
       php7.0-dev \
+      php-json \
       php-pear \
       re2c \
       composer
diff --git a/test/php/Makefile.am b/test/php/Makefile.am
index 5c42321..52765ee 100755
--- a/test/php/Makefile.am
+++ b/test/php/Makefile.am
@@ -26,6 +26,7 @@
 php_ext_dir:
 	mkdir -p php_ext_dir
 	ln -s ../../../lib/php/src/ext/thrift_protocol/modules/thrift_protocol.so php_ext_dir/
+	ln -s "$$(php-config --extension-dir)/json.so" php_ext_dir/
 	ln -s "$$(php-config --extension-dir)/sockets.so" php_ext_dir/
 
 precross: stubs php_ext_dir
diff --git a/test/php/test_php.ini b/test/php/test_php.ini
index 3f9bb21..aeb67cb 100644
--- a/test/php/test_php.ini
+++ b/test/php/test_php.ini
@@ -1,2 +1,3 @@
 extension=thrift_protocol.so
+extension=json.so
 extension=sockets.so
diff --git a/test/tests.json b/test/tests.json
index 02ae28a..acede24 100644
--- a/test/tests.json
+++ b/test/tests.json
@@ -545,8 +545,9 @@
       ],
       "protocols": [
         "binary",
+        "binary:accel",
         "compact",
-        "binary:accel"
+        "json"
       ],
       "command": [
         "php",