diff --git a/src/variant/transform2d.cpp b/src/variant/transform2d.cpp
index b83936a..530a99e 100644
--- a/src/variant/transform2d.cpp
+++ b/src/variant/transform2d.cpp
@@ -30,6 +30,8 @@
 
 #include <godot_cpp/variant/transform2d.hpp>
 
+#include <godot_cpp/variant/string.hpp>
+
 namespace godot {
 
 void Transform2D::invert() {