1 files changed, 1 insertions, 0 deletions

diff --git a/src/php_snuffleupagus.h b/src/php_snuffleupagus.h
index bccf998..cf50a10 100644
--- a/src/php_snuffleupagus.h
+++ b/src/php_snuffleupagus.h
@@ -26,6 +26,7 @@
 #include "zend_extensions.h"
 
 #include "sp_list.h"
+#include "sp_tree.h"
 #include "sp_var_parser.h"
 #include "sp_config.h"
 #include "sp_config_utils.h"