diff --git a/include/sqlpp11/connection_pool.h b/include/sqlpp11/connection_pool.h
index 68928ef6..5d70a270 100644
--- a/include/sqlpp11/connection_pool.h
+++ b/include/sqlpp11/connection_pool.h
@@ -27,8 +27,10 @@ ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */
 
+#include <sqlpp11/connection.h>
 #include <sqlpp11/detail/circular_buffer.h>
 
+#include <memory>
 #include <mutex>
 #include <stdexcept>