diff --git a/composer.json b/composer.json
index 55d5812..07f3bcb 100644
--- a/composer.json
+++ b/composer.json
@@ -38,7 +38,7 @@
     ],
     "scripts": {
         "test": "@php vendor/bin/tester -C -p php tests",
-        "testphp5": "@php vendor/bin/tester -p php tests"
+        "testphp5": "@php vendor/bin/tester -c tests/php5.3-5.5.ini -p php tests"
     },
     "scripts-descriptions": {
         "test": "Run all tests!"
diff --git a/tests/php5.3-5.5.ini b/tests/php5.3-5.5.ini
new file mode 100644
index 0000000..50f8459
--- /dev/null
+++ b/tests/php5.3-5.5.ini
@@ -0,0 +1,10 @@
+[PHP]
+
+extension=json.so
+extension=tokenizer.so
+
+memory_limit=512M
+
+error_reporting=-1
+display_errors=On
+display_startup_errors = On