diff --git a/include/edyn/shapes/compound_shape.hpp b/include/edyn/shapes/compound_shape.hpp
index 27c1fe39..33cd3915 100644
--- a/include/edyn/shapes/compound_shape.hpp
+++ b/include/edyn/shapes/compound_shape.hpp
@@ -2,6 +2,7 @@
 #define EDYN_SHAPES_COMPOUND_SHAPE_HPP
 
 #include <vector>
+#include <string>
 #include <variant>
 #include "edyn/shapes/sphere_shape.hpp"
 #include "edyn/shapes/cylinder_shape.hpp"
diff --git a/include/edyn/shapes/polyhedron_shape.hpp b/include/edyn/shapes/polyhedron_shape.hpp
index 69a95fb6..bc970543 100644
--- a/include/edyn/shapes/polyhedron_shape.hpp
+++ b/include/edyn/shapes/polyhedron_shape.hpp
@@ -2,6 +2,7 @@
 #define EDYN_SHAPES_POLYHEDRON_HPP
 
 #include <memory>
+#include <string>
 #include "edyn/shapes/convex_mesh.hpp"
 
 namespace edyn {