diff --git a/src/binding.cc b/src/binding.cc
index 6081171..17794a8 100644
--- a/src/binding.cc
+++ b/src/binding.cc
@@ -1,3 +1,4 @@
+#include <pg_config.h>
 #include <libpq-fe.h>
 #include <node.h>
 #include <node_buffer.h>