diff --git a/src/fptostring.cpp b/src/fptostring.cpp
index d12bbc0..b27920c 100644
--- a/src/fptostring.cpp
+++ b/src/fptostring.cpp
@@ -1,6 +1,7 @@
 // SPDX-FileCopyrightText: 2024 Simon Gene Gottlieb
 // SPDX-License-Identifier: MIT
 
+#include "yaml-cpp/fptostring.h"
 #include "contrib/dragonbox.h"
 
 #include <array>