diff --git a/extension/xhprof.c b/extension/xhprof.c
--- a/extension/xhprof.c
+++ b/extension/xhprof.c
@@ -1703,8 +1703,30 @@
 
   if (!_zend_execute_internal) {
     /* no old override to begin with. so invoke the builtin's implementation  */
+
+#if ZEND_EXTENSION_API_NO >= 220121212
+    /* PHP 5.5. This is just inlining a copy of execute_internal(). */
+
+    if (fci != NULL) {
+      ((zend_internal_function *) execute_data->function_state.function)->handler(
+        fci->param_count,
+        *fci->retval_ptr_ptr,
+        fci->retval_ptr_ptr,
+        fci->object_ptr,
+        1 TSRMLS_CC);
+    } else {
+      zval **return_value_ptr = &EX_TMP_VAR(execute_data, execute_data->opline->result.var)->var.ptr;
+      ((zend_internal_function *) execute_data->function_state.function)->handler(
+        execute_data->opline->extended_value,
+        *return_value_ptr,
+        (execute_data->function_state.function->common.fn_flags & ZEND_ACC_RETURN_REFERENCE)
+          ? return_value_ptr
+          : NULL,
+        execute_data->object,
+        ret TSRMLS_CC);
+    }
+#elif ZEND_EXTENSION_API_NO >= 220100525
     zend_op *opline = EX(opline);
-#if ZEND_EXTENSION_API_NO >= 220100525
     temp_variable *retvar = &EX_T(opline->result.var);
     ((zend_internal_function *) EX(function_state).function)->handler(
                        opline->extended_value,
@@ -1713,6 +1735,7 @@
                        &retvar->var.ptr:NULL,
                        EX(object), ret TSRMLS_CC);
 #else
+    zend_op *opline = EX(opline);
     ((zend_internal_function *) EX(function_state).function)->handler(
                        opline->extended_value,
                        EX_T(opline->result.u.var).var.ptr,