diff --git a/src/include/dbconnector/pool.hpp b/src/include/dbconnector/pool.hpp
index fa134c2..4da6efe 100644
--- a/src/include/dbconnector/pool.hpp
+++ b/src/include/dbconnector/pool.hpp
@@ -1,5 +1,6 @@
 #pragma once
 
+#include "pool/acquire_mode.hpp"
 #include "pool/connection_pool_config.hpp"
 #include "pool/pooled_connection.hpp"
 #include "pool/thread_local_connection_cache.hpp"
diff --git a/src/include/dbconnector/pool/acquire_mode.hpp b/src/include/dbconnector/pool/acquire_mode.hpp
index 04db004..4756c2f 100644
--- a/src/include/dbconnector/pool/acquire_mode.hpp
+++ b/src/include/dbconnector/pool/acquire_mode.hpp
@@ -27,7 +27,7 @@ struct AcquireModeHelpers {
 		}
 	}
 
-	std::string ToString(AcquireMode mode) {
+	static std::string ToString(AcquireMode mode) {
 		switch (mode) {
 		case AcquireMode::FORCE:
 			return "force";
diff --git a/src/include/dbconnector/pool/connection_pool_config.hpp b/src/include/dbconnector/pool/connection_pool_config.hpp
index 90ffa6b..a69ea30 100644
--- a/src/include/dbconnector/pool/connection_pool_config.hpp
+++ b/src/include/dbconnector/pool/connection_pool_config.hpp
@@ -1,6 +1,8 @@
 #pragma once
 
 #include <cstdint>
+#include <algorithm>
+#include <thread>
 
 #include "dbconnector/pool/acquire_mode.hpp"